Derivative And Hedging Instruments (Schedule Of Effect Of Derivative Instruments Designated As Hedging Instruments In Consolidated Financial Statements) (Details) (Designated as Hedging Instrument [Member], Interest Rate Swap [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) / Gain Recognized in OCI on Derivative (Effective Portion)		$ 0.5
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) / Gain Reclassified from Accumulated OCI into Income (Effective Portion)	$ (0.2)	$ (0.7)