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Plan Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2009 Stock options	Dec. 31, 2009 Other Stock-based Awards
Incentive Compensation Plan Initiation Year		May 01, 2009
Number of shares initially available for grant				8.1	26.5
Performance condition of awards	range from 0% to 200% of the target amount
Award vesting period, years	3
Maximum award value per employee	$ 6.0
Stock option vesting period in years, minimum	2
Stock option vesting period in years, maximum	4
Stock option expiration period in years	10
Restricted Cash Plan Initiation Year			Mar. 01, 2009

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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