Annual report pursuant to Section 13 and 15(d)

Derivative Instruments (Summary Of Gain Or Loss On Effective Swaps Recognized In Other Comprehensive Income) (Details)

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Derivative Instruments (Summary Of Gain Or Loss On Effective Swaps Recognized In Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Derivative Instrument Detail [Abstract]    
Change in other comprehensive income (loss) $ 1.5 $ 0.3