Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (Not Designated as Hedging Instrument, Less Than Six Months, Fair Value, Measurements, Recurring, Other Current Assets Liabilities, Foreign Exchange Swaps, USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Not Designated as Hedging Instrument | Less Than Six Months | Fair Value, Measurements, Recurring | Other Current Assets Liabilities | Foreign Exchange Swaps
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative notional volume, amount after offsetting swaps	$ 230.4	$ 390.9
Derivative asset, amount after offsetting swaps	0.1	1.3
Derivative liability, amount after offsetting swaps	$ 1.5	$ 0.4