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Assets and liabilities Measured at Fair Value on Recurring Basis (Detail) (Level 2, USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, Assets	$ 5.6	$ 3.7
Derivative financial instruments, Liabilities	$ 4.6	$ 5.8

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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