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Stock-Based Compensation Restricted Stock Units (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Incentive shares granted	834,000		1,160,000	1,912,000
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	2.3		1.9	0.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	955,936		570,569	193,987
Incentive shares granted	336,816		400,907	459,072
Incentive share awards vested	(121,500)		(4,236)	(56,477)
Incentive share awards cancelled	(58,384)		(11,304)	(26,013)
Ending balance	1,112,868		955,936	570,569
Incentive share awards outstanding Weighted Average Contractual Term (in years)	1.06
Incentive share awards outstanding Aggregate Intrinsic Value (in millions)	9.0
Vested and expected to vest	1,057,225	[1]
Vested and expected to vest Weighted Average Contractual Term (in years)	1.1	[1]
Vested and expected to vest Aggregate Intrinsic Value (in millions)	8.6	[1]
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
[1] Incentive shares expected to vest based upon historical forfeitures rate

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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 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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