Financial Instrument Assets and (Liabilities) Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, Fair Value, Inputs, Level 2, USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Forward currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument assets and (liabilities) measured at fair value	$ 1.5	$ 1.0
Option currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument assets and (liabilities) measured at fair value	1.4	0.6
Interest rate swap contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument assets and (liabilities) measured at fair value	$ 9.8	$ 13.3