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Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Summary of Derivative Instruments [Abstract]
Cash flow hedge instrument term minimum (in months)	12
Cash flow hedge instrument term maximum (in months)	18
Cumulative unrealized gain (loss) on cash flow derivative instruments in accumulated other comprehensive loss	$ (5.2)

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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