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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net derivative gains (losses) on closed hedge instruments in AOCI that will be realized in earnings when the hedged items impact earnings	$ (2.2)	$ (2.5)
Notional amount of receive-variable/pay-fixed interest rate swaps	250.0
Receive-variable/pay-fixed interest rate swaps, maturity period	August 2017
Net AOCI balance	(32.6)	(50.8)
Net current deferred gains expected to be realized	$ (14.5)

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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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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