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Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
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)	$ 6.1

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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