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Derivative Instruments And Hedging Activities (Cumulative Amount Of Unrecognized Hedge Losses Recorded In AOCI) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ (2.5)	$ (3.0)
Interest Rate Swaps [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ (2.5)	$ (3.0)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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