Location and Fair Value of Derivative Instruments Designated as Hedging Instruments (Detail) - Derivatives Designated as Hedging Instruments - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 21.4	$ 16.1
Fair value of derivative liability	5.8	6.6
Forward currency contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1.9	1.9
Forward currency contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0.2	0.0
Forward currency contracts | Accrued Expenses
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	5.3	6.6
Forward currency contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	0.5	0.0
Option currency contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	12.4	9.3
Option currency contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1.9	0.0
Interest rate swap contract | Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	5.0	0.0
Interest rate swap contract | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 0.0	$ 4.9