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Financial Instruments (Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Foreign Government Bonds [Member]
Financial assets measured at fair value on a recurring basis	$ 15.6
Forward Currency Contracts [Member]
Financial assets measured at fair value on a recurring basis	8.6	3.5
Option Currency Contracts [Member]
Financial assets measured at fair value on a recurring basis	3.2	1.5
Interest Rate Swap Contract [Member]
Financial assets measured at fair value on a recurring basis	$ 4.7	$ 0.7

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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