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Employee Benefit Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Employee Benefits and Share-based Compensation	$ 0.8	$ 1.0	$ 6.6	$ 4.7	$ 1.4
Shares Reserved For Issuance Under Employee Stock Purchase Plan					8,000,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures		1.1			3.7
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 10.0		$ 1.1

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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