Annual report pursuant to Section 13 and 15(d)

Basis Of Presentation And Significant Accounting Policies (Details)

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Basis Of Presentation And Significant Accounting Policies (Details) (Parent Company [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Parent Company [Member]
     
Cash flows received by the parent from unrestricted subsidiaries $ 88.7 $ 38.0 $ 102.2