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Fair Value measurements (Details) (Fair value measured on recurring basis, Level 2, USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Fair value of assets and liabilities
Derivative assets	$ 0.6
Derivative liabilities	10.4
Interest Rate Swap Agreements
Fair value of assets and liabilities
Derivative liabilities	0.5
Foreign Currency Forward Exchange Contracts
Fair value of assets and liabilities
Derivative assets	0.6
Derivative liabilities	$ 9.9

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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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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