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Financial Instruments (Foreign Exchange Risk and Its Classification on Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012 contract	Dec. 31, 2011
Derivatives, Fair Value
Assets	$ 2.6	$ 3.4
Liabilities	1.9	0.4
Net derivative fair value	$ 0.7
Number of swap and forward foreign exchange contracts outstanding	25

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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