Gross and Net Amounts of Foreign Exchange Forward Contracts and Interest Rate Swaps (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Gross Amounts of Assets	$ 11.3	$ 15.3
Impact of Netting, Assets	(0.7)
Net Amounts of Asset Presented in the Condensed Consolidated Balance Sheet	10.6	15.3
All Other Amounts Subject to Master Netting Agreements	(2.9)	(3.6)
Potential Net Amounts of Assets	7.7	11.7
Not Designated as Hedging Instrument | Foreign Exchange Forward Contracts Reported Gross
Derivative [Line Items]
Gross Amounts of Assets	0.2	0.6
Net Amounts of Asset Presented in the Condensed Consolidated Balance Sheet	0.2	0.6
All Other Amounts Subject to Master Netting Agreements	(0.1)	(0.1)
Potential Net Amounts of Assets	0.1	0.5
Gross Amounts of Liabilities	2.7	24.0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	2.7	24.0
All Other Amounts Subject to Master Netting Agreements	(1.5)	(3.6)
Potential Net Amounts of Liabilities	1.2	20.4
Not Designated as Hedging Instrument | Foreign Exchange Forward Contracts Reported Net
Derivative [Line Items]
Gross Amounts of Assets	0.7
Impact of Netting, Assets	(0.7)
Gross Amounts of Liabilities	2.3
Impact of Netting, Liabilities	(0.7)
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	1.6
All Other Amounts Subject to Master Netting Agreements	(1.4)
Potential Net Amounts of Liabilities	0.2
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Gross Amounts of Assets	0.9
Impact of Netting, Assets	(0.7)
Net Amounts of Asset Presented in the Condensed Consolidated Balance Sheet	0.2
All Other Amounts Subject to Master Netting Agreements	(0.1)
Potential Net Amounts of Assets	0.1
Gross Amounts of Liabilities	5.0
Impact of Netting, Liabilities	(0.7)
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	4.3
All Other Amounts Subject to Master Netting Agreements	(2.9)
Potential Net Amounts of Liabilities	1.4
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Gross Amounts of Assets	10.4	14.7
Net Amounts of Asset Presented in the Condensed Consolidated Balance Sheet	10.4	14.7
All Other Amounts Subject to Master Netting Agreements	(2.8)	(3.5)
Potential Net Amounts of Assets	$ 7.6	$ 11.2