Derivatives (Schedule Of Gains (Losses) For Derivatives Designated As Fair Value Hedges) (Details) (Investment and Other Income (Expense)- Net [Member], Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized as ineffectiveness in the consolidated statements of operations	$ 1.2	$ 2.1
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized as ineffectiveness in the consolidated statements of operations	3.1	16.8
Hedged Items [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized as ineffectiveness in the consolidated statements of operations	$ (1.9)	$ (14.7)