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	Dec. 31, 2014	Dec. 31, 2013
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	$ (4.7)	$ 0.7
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	9.3	1.3
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	$ 4.9	$ 8.9