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Long-Term Incentive Plan (Details) (Omnibus Stock Incentive Plans, 2007 [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Omnibus Stock Incentive Plans, 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Compensation expense recognized	$ 6.4	$ 4.2	$ 1.9

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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