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Derivative Instruments and Hedging Activities AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) beginning balance	$ 1.7
Unrealized (loss) gain on derivative instruments	(27.2)
Reclassification adjustment on derivative instruments	2.4
Tax benefit (expense)	8.8
Accumulated Other Comprehensive Income (Loss) ending balance	$ (14.3)

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 net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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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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