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Stock-Based Compensation Restricted Stock Units (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Incentive shares granted	971,000
Ending balance	80,356
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Outstanding, Intrinsic Value	$ 22.9
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	1.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	1,112,868
Incentive shares granted	318,926
Incentive share awards vested	(407,909)
Incentive share awards cancelled	(35,519)
Ending balance	988,366
Incentive share awards outstanding Weighted Average Contractual Term (in years)	1.60
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Outstanding, Intrinsic Value	10.8
Vested and expected to vest	938,948
Vested and expected to vest Weighted Average Contractual Term (in years)
Vested and expected to vest Aggregate Intrinsic Value (in millions)	10.3
Incentive share awards exercisable	0
Incentive share awards exercisable Weighted Average Contractual Term (in years)	0
Incentive share awards exercisable Aggregate Intrinsic Value (in millions)	$ 0

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

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