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