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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2011	Jul. 14, 2011
Document and Entity Information
Entity Registrant Name	INTUITIVE SURGICAL INC
Entity Central Index Key	0001035267
Current Fiscal Year End Date	--12-31
Trading Symbol	ISRG
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		39,083,127
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 382.0	$ 279.8
Short-term investments	611.9	630.6
Accounts receivable, net	250.3	246.8
Inventory	100.1	86.8
Prepaids and other assets	17.0	23.3
Deferred tax assets	4.0	8.5
Total current assets	1,365.3	1,275.8
Property, plant and equipment, net	194.2	159.8
Long-term investments	828.1	698.5
Long-term deferred tax assets	77.3	73.3
Intangible and other assets, net	68.1	66.1
Goodwill	116.9	116.9
Total assets	2,649.9	2,390.4
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	37.5	35.6
Accrued compensation and employee benefits	54.6	63.4
Deferred revenue	134.3	126.1
Other accrued liabilities	47.6	48.7
Total current liabilities	274.0	273.8
Long-term liabilities	87.4	79.2
Total liabilities	361.4	353.0
Commitments and contingencies	0.0	0.0
Stockholders' equity:
Preferred stock, 2.5 shares authorized, $0.001 par value, issuable in series; no shares issued and outstanding as of June 30, 2011 and December 31, 2010	0.0	0.0
Common stock, 100.0 shares authorized, $0.001 par value, 39.1 and 38.9 shares issued and outstanding as of June 30, 2011 and December 31, 2010, respectively	0.0	0.0
Additional paid-in capital	1,487.4	1,316.9
Retained earnings	798.5	718.9
Accumulated other comprehensive income	2.6	1.6
Total stockholders' equity	2,288.5	2,037.4
Total liabilities and stockholders' equity	$ 2,649.9	$ 2,390.4

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Preferred stock, shares authorized	2.5	2.5
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares issued	0.0	0.0
Preferred stock, shares outstanding	0.0	0.0
Common stock, shares authorized	100.0	100.0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares issued	39.1	38.9
Common stock, shares outstanding	39.1	38.9

Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue:
Product	$ 358.1	$ 295.3	$ 682.6	$ 573.3
Service	67.6	55.4	131.2	106.0
Total revenue	425.7	350.7	813.8	679.3
Cost of revenue:
Product	93.5	72.7	178.3	140.7
Service	25.6	21.2	50.1	41.3
Total cost of revenue	119.1	93.9	228.4	182.0
Gross profit	306.6	256.8	585.4	497.3
Operating expenses:
Selling, general, and administrative	106.5	88.6	205.6	171.4
Research and development	32.0	28.5	63.4	56.5
Total operating expenses	138.5	117.1	269.0	227.9
Income from operations	168.1	139.7	316.4	269.4
Interest and other income, net	4.1	4.5	9.4	8.6
Income before taxes	172.2	144.2	325.8	278.0
Income tax expense	54.8	55.5	104.3	104.0
Net income	$ 117.4	$ 88.7	$ 221.5	$ 174.0
Earnings per share:
Basic	$ 2.99	$ 2.26	$ 5.65	$ 4.45
Diluted	$ 2.91	$ 2.19	$ 5.51	$ 4.31
Shares used in computing earnings per share:
Basic	39.2	39.3	39.2	39.1
Diluted	40.3	40.5	40.2	40.4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities:
Net income	$ 221.5	$ 174.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13.8	11.4
Amortization of intangible assets	8.7	7.9
Deferred income taxes	0.8	0.4
Income tax benefits from employee stock option plans	21.1	40.7
Excess tax benefit from stock-based compensation	(24.4)	(46.9)
Share-based compensation expense	66.9	57.1
Changes in operating assets and liabilities:
Accounts receivable	(3.5)	10.7
Inventory	(13.3)	(16.4)
Prepaids and other assets	(3.1)	0.8
Accounts payable	1.8	14.3
Accrued compensation and employee benefits	(9.0)	(7.5)
Deferred revenue	8.5	8.3
Accrued liabilities	6.5	36.3
Net cash provided by operating activities	296.3	291.1
Investing Activities:
Purchase of investments	(725.9)	(604.3)
Proceeds from sales and maturities of investments	619.3	386.6
Purchase of property and equipment and acquisition of intellectual property	(53.2)	(36.5)
Net cash used in investing activities	(159.8)	(254.2)
Financing Activities:
Proceeds from issuance of common stock, net	91.2	115.9
Excess tax benefit from stock-based compensation	24.4	46.9
Repurchase and retirement of common stock	(150.7)	0.0
Net cash provided by (used in) financing activities	(35.1)	162.8
Effect of exchange rate changes on cash and cash equivalents	0.8	(1.1)
Net increase in cash and cash equivalents	102.2	198.6
Cash and cash equivalents, beginning of period	279.8	221.4
Cash and cash equivalents, end of period	$ 382.0	$ 420.0

Description of Business

6 Months Ended

Jun. 30, 2011

Description of Business

Description of Business

NOTE 1. DESCRIPTION OF BUSINESS

Intuitive Surgical, Inc. designs, manufactures, and markets the da Vinci Surgical System, which is an advanced surgical system that the Company believes represents a new generation of surgery. The da Vinci Surgical System consists of a surgeon's console or consoles, a patient-side cart, a high performance vision system and proprietary "wristed" instruments. The da Vinci Surgical System translates the surgeon's natural hand movements on instrument controls at the console into corresponding micro-movements of instruments positioned inside the patient through small puncture incisions, or ports. The Company markets its products through sales representatives in the United States, and through a combination of sales representatives and distributors in its international markets.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2011

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements ("financial statements") of Intuitive Surgical, Inc. and its wholly-owned subsidiaries have been prepared on a consistent basis with the December 31, 2010 audited Consolidated Financial Statements and include all adjustments, consisting of only normal recurring adjustments, necessary to fairly state the information set forth herein. These financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC"), and, therefore, omit certain information and footnote disclosure necessary to present the statements in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"). These financial statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2010, which was filed on February 1, 2011. The results of operations for the first six months of fiscal 2011 are not indicative of the results to be expected for the entire fiscal year or any future periods.

New Accounting Standards Recently Adopted

No new accounting standards have been adopted since the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2010 was filed.

Recent Accounting Pronouncements

In June 2011, the FASB issued new accounting guidance related to the presentation of comprehensive income that increases comparability between U.S. GAAP and IFRS. This guidance eliminates the current option to report other comprehensive income and its components in the statement of changes in equity and instead requires presenting in one continuous statement or two separate but consecutive statements. This guidance is effective for the Company's interim and annual periods beginning January 1, 2012. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial statements, as it only requires a change in the format of presentation.

Cash, Cash Equivalents & Investments

6 Months Ended

Jun. 30, 2011

Cash, Cash Equivalents & Investments

Cash, Cash Equivalents & Investments

NOTE 3. CASH, CASH EQUIVALENTS & INVESTMENTS

The following tables summarize the Company's cash, cash equivalents and investments as of June 30, 2011 and December 31, 2010 (in millions):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2011
Cash and cash equivalents:
Cash	$	20.3	$	0	$	0		$	20.3
Cash equivalents		361.7		0		0			361.7

Total cash and cash equivalents	$	382.0	$	0	$	0		$	382.0

Available for sale investments:
Short-term
Commercial paper	$	90.3	$	0	$	0		$	90.3
Municipal notes		108.4		0.3		0			108.7
U.S. corporate debt & equity securities		170.0		1.4		0			171.4
U.S. treasuries		106.8		0.1		0			106.9
U.S. government agencies		134.4		0.2		0			134.6

Total short-term	$	609.9	$	2.0	$	0		$	611.9

Long-term
Municipal notes	$	142.8	$	0.6	$	(3.9	)	$	139.5
U.S. corporate debt		380.9		2.4		(0.3	)		383.0
U.S. treasuries		18.4		0.1		0			18.5
U.S. government agencies		253.2		0.9		0			254.1
Non-U.S. government securities		32.7		0.3		0			33.0

Total long-term	$	828.0	$	4.3	$	(4.2	)	$	828.1


Total cash, cash equivalents and available for sale investments	$	1,819.9	$	6.3	$	(4.2	)	$	1,822.0


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2010
Cash and cash equivalents:
Cash	$	20.1	$	0	$	0		$	20.1
Cash equivalents		259.7		0		0			259.7

Total cash and cash equivalents	$	279.8	$	0	$	0		$	279.8

Available for sale investments:
Short-term
Commercial paper	$	79.0	$	0	$	0		$	79.0
Municipal notes		111.8		0.4		0			112.2
U.S. corporate debt		174.1		1.3		0			175.4
U.S. treasuries		76.3		0		0			76.3
U.S. government agencies		187.4		0.3		0			187.7

Total short-term	$	628.6	$	2.0	$	0		$	630.6

Long-term
Municipal notes	$	143.4	$	0.3	$	(4.3	)	$	139.4
U.S. corporate debt		300.4		1.8		(0.9	)		301.3
U.S. treasuries		39.9		0.1		0			40.0
U.S. government agencies		196.7		0.3		(0.4	)		196.6
Non-U.S. government securities		21.2		0.1		(0.1	)		21.2

Total long-term	$	701.6	$	2.6	$	(5.7	)	$	698.5


Total cash, cash equivalents and available for sale investments	$	1,610.0	$	4.6	$	(5.7	)	$	1,608.9

The following table summarizes the maturities of the Company's cash equivalents and available-for-sale investments, excluding equity securities, as of June 30, 2011 (in millions):


	Amortized Cost		Fair Value
Mature in less than one year	$	970.9	$	972.4
Mature in one to five years		805.5		809.4
Mature in more than five years		22.5		18.7

Total	$	1,798.9	$	1,800.5

During the six months ended June 30, 2011, realized gains recognized on the sale of investments were approximately $2.4 million. Realized gains and losses recognized for three months ended June 30, 2011 and three and six months ended June 30, 2010 were not significant. As of June 30, 2011 and December 31, 2010, net unrealized gains on available-for-sale securities, net of tax, of $2.1 million and $1.3 million, respectively were included in accumulated other comprehensive income in the accompanying unaudited Condensed Consolidated Balance Sheets. At June 30, 2011, the Company evaluated its gross unrealized losses, the majority of which were from auction-rate securities (ARS). The Company determined these unrealized losses to be temporary, because the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell these securities before the recovery of their amortized cost basis.

Fair Value Measurements

6 Months Ended

Jun. 30, 2011

Fair Value Measurements

Fair Value Measurements

NOTE 4. FAIR VALUE MEASUREMENTS

The Company measures certain financial assets, including cash equivalents, available-for-sale securities and foreign currency derivatives at their fair value. The fair value of these financial assets was determined based on three levels of inputs, of which the first two are considered observable and the last unobservable, as follows:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The following tables represent the Company's fair value hierarchy for its financial assets and liabilities as of June 30, 2011 and December 31, 2010 (in millions):


	Fair Value Measurements at June 30, 2011 Using
Assets	Level 1		Level 2		Level 3		Total
Available-for-sale securities
Money Market funds	$	337.9	$	0	$	0	$	337.9
U.S. treasuries		125.4		0		0		125.4
Commercial paper		0		114.1		0		114.1
Corporate debt & equity securities		1.2		553.2		0		554.4
U.S. government agencies		0		388.7		0		388.7
Non-U.S. government securities		0		33.0		0		33.0
Municipal notes		0		229.5		18.7		248.2

Total available-for-sale securities		464.5		1,318.5		18.7		1,801.7

Total assets measured at fair value	$	464.5	$	1,318.5	$	18.7	$	1,801.7


Liabilities
Foreign Currency Derivatives	$	0	$	2.2	$	0	$	2.2

Total liabilities measured at fair value	$	0	$	2.2	$	0	$	2.2


	Fair Value Measurements at December 31, 2010 Using
Assets	Level 1		Level 2		Level 3		Total
Available-for-sale securities
Money Market funds	$	211.2	$	0	$	0	$	211.2
U.S. treasuries		116.3		0		0		116.3
Commercial paper		0		122.5		0		122.5
Corporate debt		0		476.8		0		476.8
U.S. government agencies		0		389.2		0		389.2
Non-U.S. government securities		0		21.1		0		21.1
Municipal notes		0		233.1		18.6		251.7

Total available-for-sale securities		327.5		1,242.7		18.6		1,588.8

Foreign Currency Derivatives		0		0.2		0		0.2

Total assets measured at fair value	$	327.5	$	1,242.9	$	18.6	$	1,589.0


Liabilities
Foreign Currency Derivatives	$	0	$	2.1	$	0	$	2.1

Total liabilities measured at fair value	$	0	$	2.1	$	0	$	2.1

Level 2 securities are priced using quoted market prices for similar instruments, nonbinding market prices that are corroborated by observable market data, or discounted cash flow techniques. The Company's derivative instruments are primarily classified as Level 2 as they are not actively traded and are valued using pricing models that use observable market inputs. There have been no transfers between Level 1 and Level 2 measurements during the three and six months ended June 30, 2011. Level 3 assets consist of municipal bonds with an auction reset feature (ARS) whose underlying assets are student loans which are substantially backed by the federal government. Since the auctions for these securities have continued to fail since February 2008, these investments are not currently trading and therefore do not have a readily determinable fair value. The Company has valued the ARS using a discounted cash flow model based on Level 3 assumptions, including estimates of, based on data available as of June 30, 2011, interest rates, timing and amount of cash flows, credit and liquidity premiums and expected holding periods of the ARS.

Foreign currency derivative

Cash Flow Hedges

The Company enters into currency forward contracts as cash flow hedges to hedge certain forecasted revenue transactions denominated in currencies other than the U.S. dollar, primarily the Euro and GBP.

As of June 30, 2011 and December 31, 2010, the Company had notional amounts of €24.5 million and €21.0 million, respectively, of outstanding currency forward contracts entered into to hedge Euro dominated sales. The net gains (losses) reclassified to revenue related to hedged revenue transactions for the three and six months ended June 30, 2011 were $(1.0) million and $(1.6) million, respectively, compared with $1.9 million and $2.5 million, respectively, for the same periods in 2010.

Other Derivatives Not Designated as Hedging Instruments

Other derivatives not designated as hedging instruments consist primarily of forward contracts that the Company uses to hedge intercompany balances and other monetary assets or liabilities denominated in currencies other than the U.S. dollar, primarily the Euro and GBP.

As of June 30, 2011, the Company had notional amounts of €22.5 million and £2.7 million outstanding currency forward contracts that were entered into to hedge non-functional currency denominated net monetary assets, compared to €26.0 million and £2.2 million at December 31, 2010. For the three months ended June 30, 2011 and 2010, the Company had recognized gains (losses) of approximately $(1.0) million and $1.9 million, respectively, in interest and other income, net, related to derivative instruments used to hedge against balance sheet foreign currency exposures. These were offset by net foreign exchange gains (losses) of approximately $1.0 million and $(2.2) million during the three months ended June 30, 2011 and 2010, respectively, primarily related to the re-measurement of non-functional currency denominated net monetary assets. For the six months ended June 30, 2011 and 2010, the Company had recognized gains (losses) of approximately $(3.2) million and $4.1 million, respectively, in interest and other income, net, related to derivative instruments used to hedge against balance sheet foreign currency exposures. These were offset by net foreign exchange gains (losses) of approximately $3.3 million and $(4.9) million during the six months ended June 30, 2011 and 2010, respectively, primarily related to the re-measurement of non-functional currency denominated net monetary assets.

Fair Value Measurements (Narrative) (Details) € in Millions, £ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 GBP (£)	Jun. 30, 2011 EUR (€)	Dec. 31, 2010 GBP (£)	Dec. 31, 2010 EUR (€)
Notional amount of outstanding currency forward contracts entered into to hedge Euro dominated sales \| €						€ 24.5		€ 21.0
Notional amount of currency forward contracts to hedge non-functional currency denominated net monetary assets					£ 2.7	€ 22.5	£ 2.2	€ 26.0
Foreign currency transaction gain (loss) before tax	$ 1.0	$ (2.2)	$ 3.3	$ (4.9)
Net gains (losses) reclassified to revenue	(1.0)	1.9	(1.6)	2.5
Not Designated as Hedging Instrument [Member] \| Other Income [Member] \| Foreign Exchange Forward [Member]
Amounts reclassified as revenue related to hedged revenue transactions	(1.0)	1.9	(3.2)	4.1
Gains (losses) recognized as interest and other income, net, related to derivative instruments used to hedge against balance sheet foreign currency exposures	$ (1.0)	$ 1.9	$ (3.2)	$ 4.1

Fair Value Measurements (Schedule of Company's Fair Value Hierarchy) (Details) - USD ($) $ in Millions	Jun. 30, 2011	Dec. 31, 2010
Available for sale investments, fair value	$ 1,801.7	$ 1,588.8
Foreign currency derivatives, assets		0.2
Total assets measured at fair value	1,801.7	1,589.0
Foreign currency derivatives, liabilities	2.2	2.1
Total liabilities measured at fair value	2.2	2.1
Level 1 [Member]
Available for sale investments, fair value	464.5	327.5
Foreign currency derivatives, assets		0.0
Total assets measured at fair value	464.5	327.5
Foreign currency derivatives, liabilities	0.0	0.0
Total liabilities measured at fair value	0.0	0.0
Level 2 [Member]
Available for sale investments, fair value	1,318.5	1,242.7
Foreign currency derivatives, assets		0.2
Total assets measured at fair value	1,318.5	1,242.9
Foreign currency derivatives, liabilities	2.2	2.1
Total liabilities measured at fair value	2.2	2.1
Level 3 [Member]
Available for sale investments, fair value	18.7	18.6
Foreign currency derivatives, assets		0.0
Total assets measured at fair value	18.7	18.6
Foreign currency derivatives, liabilities	0.0	0.0
Total liabilities measured at fair value	0.0	0.0
Money Market Funds [Member]
Available for sale investments, fair value	337.9	211.2
Money Market Funds [Member] \| Level 1 [Member]
Available for sale investments, fair value	337.9	211.2
Money Market Funds [Member] \| Level 2 [Member]
Available for sale investments, fair value	0.0	0.0
Money Market Funds [Member] \| Level 3 [Member]
Available for sale investments, fair value	0.0	0.0
U.S. Treasuries [Member]
Available for sale investments, fair value	125.4	116.3
U.S. Treasuries [Member] \| Level 1 [Member]
Available for sale investments, fair value	125.4	116.3
U.S. Treasuries [Member] \| Level 2 [Member]
Available for sale investments, fair value	0.0	0.0
U.S. Treasuries [Member] \| Level 3 [Member]
Available for sale investments, fair value	0.0	0.0
Commercial Paper [Member]
Available for sale investments, fair value	114.1	122.5
Commercial Paper [Member] \| Level 1 [Member]
Available for sale investments, fair value	0.0	0.0
Commercial Paper [Member] \| Level 2 [Member]
Available for sale investments, fair value	114.1	122.5
Commercial Paper [Member] \| Level 3 [Member]
Available for sale investments, fair value	0.0	0.0
U.S. Corporate Debt [Member]
Available for sale investments, fair value		476.8
U.S. Corporate Debt [Member] \| Level 1 [Member]
Available for sale investments, fair value		0.0
U.S. Corporate Debt [Member] \| Level 2 [Member]
Available for sale investments, fair value		476.8
U.S. Corporate Debt [Member] \| Level 3 [Member]
Available for sale investments, fair value		0.0
U.S. Corporate Debt & Equity Securities [Member]
Available for sale investments, fair value	554.4
U.S. Corporate Debt & Equity Securities [Member] \| Level 1 [Member]
Available for sale investments, fair value	1.2
U.S. Corporate Debt & Equity Securities [Member] \| Level 2 [Member]
Available for sale investments, fair value	553.2
U.S. Corporate Debt & Equity Securities [Member] \| Level 3 [Member]
Available for sale investments, fair value	0.0
U.S. Government Agencies [Member]
Available for sale investments, fair value	388.7	389.2
U.S. Government Agencies [Member] \| Level 1 [Member]
Available for sale investments, fair value	0.0	0.0
U.S. Government Agencies [Member] \| Level 2 [Member]
Available for sale investments, fair value	388.7	389.2
U.S. Government Agencies [Member] \| Level 3 [Member]
Available for sale investments, fair value	0.0	0.0
Non-U.S. Government Securities [Member]
Available for sale investments, fair value	33.0	21.1
Non-U.S. Government Securities [Member] \| Level 1 [Member]
Available for sale investments, fair value	0.0	0.0
Non-U.S. Government Securities [Member] \| Level 2 [Member]
Available for sale investments, fair value	33.0	21.1
Non-U.S. Government Securities [Member] \| Level 3 [Member]
Available for sale investments, fair value	0.0	0.0
Municipal Notes [Member]
Available for sale investments, fair value	248.2	251.7
Municipal Notes [Member] \| Level 1 [Member]
Available for sale investments, fair value	0.0	0.0
Municipal Notes [Member] \| Level 2 [Member]
Available for sale investments, fair value	229.5	233.1
Municipal Notes [Member] \| Level 3 [Member]
Available for sale investments, fair value	$ 18.7	$ 18.6

Balance Sheet Details (Details) - USD ($) $ in Millions	3 Months Ended
Balance Sheet Details (Details) - USD ($) $ in Millions	Jun. 30, 2011	Dec. 31, 2010
Balance Sheet Details
Raw materials	$ 26.8	$ 25.6
Work-in-process	2.6	2.5
Finished goods	70.7	58.7
Total	100.1	$ 86.8
Purchase of land and equipment	$ 33.1

Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	Jun. 30, 2011	Dec. 31, 2010
Stockholders' Equity
Foreign currency translation gains	$ 0.4	$ 0.1
Accumulated net realized gains on derivatives, net of tax	0.1	0.2
Accumulated net realized gains on available-for-sale securities, net of tax	2.1	1.3
Total accumulated other comprehensive income	$ 2.6	$ 1.6

Stock-Based Compensation (Summary of Stock Option Activity Under all Stock Plans) (Details) shares in Millions	6 Months Ended
	Jun. 30, 2011 $ / shares shares
Stock-Based Compensation
Beginning balance, shares available for grant	1.4
Options authorized, shares available for grant	1.3
Options granted, shares available for grant	(1.2)
Ending balance, shares available for grant	1.5
Beginning balance, number of options outstanding	4.8
Options granted, number outstanding	1.2
Options exercised, number outstanding	(0.5)
Options forfeited/expired, number outstanding	(0.1)
Ending balance, number of options outstanding	5.4
Beginning balance, number of options outstanding, weighted average exercise price per share \| $ / shares	$ 209.03
Options granted, weighted average exercise price per share \| $ / shares	339.76
Options exercised, weighted average exercise price per share \| $ / shares	142.81
Options forfeited/expired, weighted average exercise price per share \| $ / shares	274.47
Ending balance, number of options outstanding, weighted average exercise price per share \| $ / shares	$ 244.66

Stock-Based Compensation (Fair Value of the Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions) (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011 USD ($) $ / shares	Jun. 30, 2010 USD ($) $ / shares	Jun. 30, 2011 USD ($) $ / shares	Jun. 30, 2010 USD ($) $ / shares
Stock Option Plans [Member]
Average risk free interest rate	1.95%	2.33%	2.30%	2.33%
Average expected term (years)	4.6	4.6	4.8	4.8
Average expected volatility	35.00%	37.00%	35.00%	35.00%
Weighted average fair value at grant date \| $ / shares	$ 113.55	$ 115.53	$ 114.67	$ 111.69
Total stock-based compensation expense \| $	$ 32.8	$ 28.3	$ 62.8	$ 53.2
Employee Stock Purchase Plan [Member]
Average risk free interest rate			0.37%	0.49%
Average expected term (years)			1.3	1.3
Average expected volatility			35.00%	35.00%
Weighted average fair value at grant date \| $ / shares			$ 97.07	$ 99.34
Total stock-based compensation expense \| $	$ 2.0	$ 2.0	$ 4.1	$ 3.9

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes
Income tax expense	$ 54.8	$ 55.5	$ 104.3	$ 104.0
Tax expense, percentage of pre-tax income	31.80%	38.50%	32.00%	37.40%
Federal statutory tax rate	35.00%		35.00%
Total gross unrecognized tax benefits	$ 86.2		$ 86.2		$ 78.9
Unrecognized tax benefits, period increase			7.3
Unrecognized tax benefits that would reduce company's effective tax rate	81.9		81.9		74.7
Gross interest related to unrecognized tax benefits accrued	$ 6.6		$ 6.6		$ 5.5