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Stock-Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of eligible earnings designated to purchase common stock through the employee stock purchase plan (in hundredths)	10.00%
Discount rate to the average closing price at which employees may purchase stock (in hundredths)	5.00%
Stock based compensation expense	$ 53,400,000	$ 40,800,000	$ 31,700,000
Tax effect recognized in net income related to stock based compensation expense under all plans	18,700,000	14,300,000	11,100,000
Tax benefit from option exercises and vesting of restricted stock under all plans	16,000,000	30,800,000	12,700,000
Percentage of market value at which stock option are granted (in hundredths)	100.00%
Weighted average assumptions used in calculating the weighted average fair value of options granted
Weighted average fair value of options granted (per share)	$ 37.08	$ 30.25	$ 24.45
Risk-free interest rate (in hundredths)	0.86%	0.77%	1.91%
Average expected option life	5 years 3 months 29 days	5 years 2 months 26 days	5 years 4 months 2 days
Expected Volatility (in hundredths)	36.09%	36.51%	35.27%
Expected dividend yield (in hundredths)	0.56%	0.58%	0.60%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares Outstanding, beginning balance (in shares)	2,918,195	3,822,662
Number of shares granted (in shares)	601,350	538,100
Options Exercised	424,945	1,389,069
Number of shares canceled (in shares)	(106,164)	(53,498)
Number of shares outstanding, ending balance (in shares)	2,988,436	2,918,195	3,822,662
Number of shares, Options, Exercisable, Number	1,859,725
Weighted Average Exercise Price [Abstract]
Weighted average exercise price per share outstanding, beginning balance (in dollars per share)	$ 63.15	$ 50.44
Weighted average exercise price per share granted (in dollars per share)	$ 117.78	$ 95.27
Weighted average exercise price per share exercised (in dollars per share)	$ 56.48	$ 40.46
Weighted average exercise price per share cancelled (in dollars per share)	$ 98.74	$ 70.01
Weighted average exercise price per share outstanding, ending balance (in dollars per share)	$ 74.00	$ 63.15	$ 50.44
Weighted average remaining contractual term of options outstanding (in years)	6 years 2 months 22 days	6 years 6 months 7 days
Aggregate intrinsic value of options outstanding	193,279,214,000	141,029,378,000
Options, Exercisable, Weighted Average Exercise Price	$ 56.99	$ 51.44
Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 10 months 7 days	5 years 2 months 5 days
Options, Exercisable, Aggregate intrinsic value	151,929,651,000	97,030,148,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Total unrecognized compensation expense related to nonvested options granted	23,700,000
Weighted-average period over which unrecognized compensation costs on non-vested stock options are expected to be recognized (in years)	2 years
Intrinsic value of options exercised	28,800,000	86,000,000	41,200,000
Cash received from option exercises under all plans	24,000,000	56,100,000
Summary of nonvested shares activity [Rollforward]
Non-vested shares outstanding, beginning of period	571,905	753,811
Nonvested shares granted	399,540	374,307
Nonvested shares vested	373,946	551,051
Nonvested shares forfeited	(23,649)	(5,162)
Nonvested shares outstanding, end of period	573,850	571,905	753,811
Restricted Stock Awards [Abstract]
Weighted average fair value of nonvested shares, beginning of period (in dollars per share)	$ 80.96	$ 61.15
Weighted Average Restricted Award Grant Date Fair Value	$ 117.74	$ 95.78
Weighted average fair value of shares vested (in dollars per share)	$ 126.80	$ 64.59
Weighted average fair value of nonvested shares forfeited (in dollars per share)	$ 124.48	$ 70.56
Weighted average fair value of nonvested shares, end of period (in dollars per share)	$ 103.44	$ 80.96	$ 61.15
Summary of nonvested shares, additional disclosures
Weighted average fair value of nonvested shares, beginning of period (in dollars per share)	$ 80.96	$ 61.15
Weighted Average Restricted Award Grant Date Fair Value	$ 117.74	$ 95.78
Weighted average fair value of shares vested (in dollars per share)	$ 126.80	$ 64.59
Weighted average fair value of nonvested shares forfeited (in dollars per share)	$ 124.48	$ 70.56
Weighted average fair value of nonvested shares, end of period (in dollars per share)	$ 103.44	$ 80.96	$ 61.15
Total unrecognized compensation expense related to nonvested restricted stock granted to both employees and directors	38,900,000
Restricted Awards Outstanding, Weighted Average Remaining Contractual Terms	2 years
Employee Stock Purchase Plan
Shares of stock purchased during the period by participants in the employee stock purchase plan	20,211	22,863	27,756
Amount paid for stock purchased during the period by participants in the employee stock purchase plan	2,400,000	2,200,000	2,100,000
Exercise Price Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 14.09
Exercise price range, upper range limit (in dollars per share)	$ 28.17
Options outstanding	157,638
Average exercise price of options outstanding	$ 23.7
Average remaining life of options outstanding (years)	2 months 18 days
Exercisable options	157,638
Average exercise price of exercisable options	$ 23.7
Exercise Price Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 28.17
Exercise price range, upper range limit (in dollars per share)	$ 42.26
Options outstanding	126,574
Average exercise price of options outstanding	$ 41.81
Average remaining life of options outstanding (years)	5 years 2 months 18 days
Exercisable options	126.574
Average exercise price of exercisable options	$ 41.81
Exercise Price Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 42.27
Exercise price range, upper range limit (in dollars per share)	$ 56.34
Options outstanding	1,113,058
Average exercise price of options outstanding	$ 53.79
Average remaining life of options outstanding (years)	4 years 5 months 25 days
Exercisable options	1,113,058
Average exercise price of exercisable options	$ 53.79
Exercise Price Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 56.35
Exercise price range, upper range limit (in dollars per share)	$ 70.43
Options outstanding	96,800
Average exercise price of options outstanding	$ 67.88
Average remaining life of options outstanding (years)	7 years 6 months
Exercisable options	45,300
Average exercise price of exercisable options	$ 66.71
Exercise Price Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 70.44
Exercise price range, upper range limit (in dollars per share)	$ 84.52
Options outstanding	453,392
Average exercise price of options outstanding	$ 74.63
Average remaining life of options outstanding (years)	7 years 1 month 5 days
Exercisable options	278,034
Average exercise price of exercisable options	$ 75.21
Exercise Price Range 6 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 84.53
Exercise price range, upper range limit (in dollars per share)	$ 98.60
Options outstanding	419,924
Average exercise price of options outstanding	$ 94.00
Average remaining life of options outstanding (years)	8 years 1 month 5 days
Exercisable options	130,085
Average exercise price of exercisable options	$ 93.91
Exercise Price Range 7 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 98.61
Exercise price range, upper range limit (in dollars per share)	$ 112.69
Options outstanding	48,700
Average exercise price of options outstanding	$ 103.41
Average remaining life of options outstanding (years)	8 years 7 months 10 days
Exercisable options	9,036
Average exercise price of exercisable options	$ 103.64
Exercise Price Range 8 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 112.70
Exercise price range, upper range limit (in dollars per share)	$ 126.77
Options outstanding	547,350
Average exercise price of options outstanding	$ 117.03
Average remaining life of options outstanding (years)	9 years 2 months 18 days
Exercisable options	0
Average exercise price of exercisable options	$ 0
Exercise Price Range 9 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 126.78
Exercise price range, upper range limit (in dollars per share)	$ 140.86
Options outstanding	25,000
Average exercise price of options outstanding	$ 131.54
Average remaining life of options outstanding (years)	8 years 7 months 10 days
Exercisable options	0
Average exercise price of exercisable options	$ 0
Exercise price range total shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 14.09
Exercise price range, upper range limit (in dollars per share)	$ 140.86
Options outstanding	2,988,436
Average exercise price of options outstanding	$ 74.00
Average remaining life of options outstanding (years)	6 years 2 months 18 days
Exercisable options	1,859,725
Average exercise price of exercisable options	$ 56.99
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period	10 years
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	16,900,000	14,800,000	12,200,000
Employee Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vest period	3 years
Employee Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vest period	5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 36,500,000	$ 25,900,000	$ 19,500,000
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vest period	1 year
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	5,714,062
2006 Plan [Member] | Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance		14,000,000

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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