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Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 days	Dec. 31, 2010
Derivative Instruments [Abstract]
Notional amounts of the forward contracts	$ 118.3	$ 85.1
Net loss from forward contracts	6.1	0.5
Foreign exchange forward contracts, settlement, period, in days	30
Net (liability) asset	$ (0.8)	$ 0.1

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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- Definition

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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