Stock-Based Compensation (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010
Shares
Number of share options granted during the period (in shares)	300,000	400,000
Stock Options
Shares
Options outstanding at the beginning of the period (in shares)	7,000,000	7,400,000
Number of share options granted during the period (in shares)	300,000	400,000	700,000
Exercised (in shares)	(1,700,000)	(600,000)
Cancelled (in shares)	0	(200,000)
Options outstanding at the end of the period (in shares)	5,600,000	7,000,000
Options exercisable (in shares)	4,200,000
Weighted Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)	$ 16.00	$ 15.27
Granted (in dollars per share)	$ 29.08	$ 18.14
Exercised (in dollars per share)	$ 10.92	$ 8.35
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 27.07	$ 16.66
Options outstanding at the end of the period (in dollars per share)	$ 18.23	$ 16.00
Options exercisable (in dollars per share)	$ 17.86
Aggregate Intrinsic Value
Options outstanding (in dollars)	$ 36.3
Options exercisable (in dollars)	$ 29.8

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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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