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	Sep. 30, 2015	Dec. 31, 2014
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	$ (5.4)	$ (4.7)
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	6.9	9.3
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	$ (9.1)	$ 4.9