Location and Fair Value of Derivative Instruments Segregated Between Designated and Not Designated Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 19.5	$ 17.9
Fair value of derivative liability	0.9	6.4
Derivatives Designated as Hedging Instruments | Forward currency contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1.3	1.5
Derivatives Designated as Hedging Instruments | Forward currency contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0.3
Derivatives Designated as Hedging Instruments | Forward currency contracts | Accrued Expenses
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	0.8	6.4
Derivatives Designated as Hedging Instruments | Forward currency contracts | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	0.1
Derivatives Designated as Hedging Instruments | Option currency contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	2.7	4.3
Derivatives Designated as Hedging Instruments | Option currency contracts | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0.6
Derivatives Designated as Hedging Instruments | Interest rate swap contract | Other Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	14.6	12.1
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair value of derivative assets		3.8
Derivatives Not Designated as Hedging Instruments | Forward currency contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets		$ 3.8