Financial Instruments and Fair Value Measurements Terminated Interest Rate Swaps (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2009 8 3/8% Subordinated Notes [Member]	Dec. 31, 2009 Senior Notes due 2015 [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives		$ 450
Notional Amount of Interest Rate Derivatives Called			250
Interest Rate Derivative Assets, at Fair Value	0
Derivative, Cash Received on Hedge			10.5	6.5
Derivative, Gain on Derivative			$ 4.0