Derivatives (Fair Value Hedges Pre-Tax Gain (Loss) Related To The Hedged Items Attributable To Changes In The Hedged Benchmark Rate Offsetting Gain Or Loss On Related Interest Rate Swaps) (Details) (Investment And Other Income (Expense) [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total gain recognized as ineffectiveness in the condensed consolidated statements of operations	$ 0.5	$ 1.2	$ 0.7	$ 1.2
Interest Rate Swaps [Member] | Fair Value Hedging [Member]
Total gain recognized as ineffectiveness in the condensed consolidated statements of operations	7.2	14.2	3.3	14.2
Hedged Items [Member] | Fair Value Hedging [Member]
Total gain recognized as ineffectiveness in the condensed consolidated statements of operations	$ (6.7)	$ (13.0)	$ (2.6)	$ (13.0)