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Derivative Instruments And Hedging Activities (Effect Of Derivative Financial Instruments On The Statements Of Income And Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest Rate Cap [Member] | Not-Designated [Member] | Other Income Loss [Member]
       
Amount of (Loss) Recognized in Statements of Income $ 0 $ (0.1) $ (0.1) $ (0.1)
Interest Rate Swaps [Member] | Cash Flow Hedge [Member] | Interest Expense [Member]
       
Unrealized (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion) 0 [1] 0 [1] 0 [1] (2.7) [1]
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) 0 [1] 0.1 [1] 0 [1] 9.9 [1]
Amount of Loss Recognized in Statements of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) 0 [1] 0 [1] 0 [1] 29.8 [1]
Interest Rate Swaps [Member] | Not-Designated [Member] | Other Income Loss [Member]
       
Amount of (Loss) Recognized in Statements of Income $ 0 $ (0.1) $ (0.7) $ (0.1)
[1] The results include the interest rate swap gain (loss) prior to discontinuation in May 2011.