Equity Incentive Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Aggregate Intrinsic Value [Abstract]
Options, Outstanding, Intrinsic Value	$ 277.7	$ 243.7
Options, Exercisable, Intrinsic Value	$ 238.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding, Number, Beginning	1,871,694
Options, Grants in Period, Net of Forfeitures	123,226
Options, Exercises in Period	(335,848)
Options, Forfeitures in Period	(12,589)
Options, Outstanding, Number, Ending	1,646,483
Options, Exercisable, Number	1,221,408
Weighted Average Exercise Price [Abstract]
Options, Outstanding, Weighted Average Exercise Price, Beginning	$ 112.57
Options, Grants in Period, Weighted Average Exercise Price	$ 263.62
Options, Exercises in Period, Weighted Average Exercise Price	$ 62.67
Options, Forfeitures in Period, Weighted Average Exercise Price	$ 145.39
Options, Outstanding, Weighted Average Exercise Price, Ending	$ 133.80
Options, Exercisable, Weighted Average Exercise Price	$ 107.39

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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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