Gross and Net Amounts of Foreign Exchange Forward Contracts and Interest Rate Swaps (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Gross Amounts of Assets	$ 3.6	$ 15.3
Impact of Netting, Assets	(0.6)
Derivatives assets	3.0	15.3
All Other Amounts Subject to Master Netting Agreements, Assets	(0.9)	(3.6)
Potential Net Amounts of Assets	2.1	11.7
Gross Amounts of Liabilities	28.7
Impact of Netting, Liabilities	(0.6)
Derivatives liabilities	28.1
All Other Amounts Subject to Master Netting Agreements, Liabilities	(0.9)
Potential Net Amounts of Liabilities	27.2
Not Designated as Hedging Instrument | Foreign Exchange Forward Contracts Reported Gross
Derivative [Line Items]
Gross Amounts of Assets	0.4	0.6
Impact of Netting, Assets
Derivatives assets	0.4	0.6
All Other Amounts Subject to Master Netting Agreements, Assets	(0.4)	(0.1)
Potential Net Amounts of Assets		0.5
Gross Amounts of Liabilities	14.6	24.0
Impact of Netting, Liabilities
Derivatives liabilities	14.6	24.0
All Other Amounts Subject to Master Netting Agreements, Liabilities		(3.6)
Potential Net Amounts of Liabilities	14.6	20.4
Not Designated as Hedging Instrument | Foreign Exchange Forward Contracts Reported Net
Derivative [Line Items]
Gross Amounts of Assets	0.6
Impact of Netting, Assets	(0.6)
Derivatives assets
All Other Amounts Subject to Master Netting Agreements, Assets
Potential Net Amounts of Assets
Gross Amounts of Liabilities	9.2
Impact of Netting, Liabilities	(0.6)
Derivatives liabilities	8.6
All Other Amounts Subject to Master Netting Agreements, Liabilities	(0.5)
Potential Net Amounts of Liabilities	8.1
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Gross Amounts of Assets	1.0
Impact of Netting, Assets	(0.6)
Derivatives assets	0.4
All Other Amounts Subject to Master Netting Agreements, Assets	(0.4)
Potential Net Amounts of Assets
Gross Amounts of Liabilities	23.8
Impact of Netting, Liabilities	(0.6)
Derivatives liabilities	23.2
All Other Amounts Subject to Master Netting Agreements, Liabilities	(0.5)
Potential Net Amounts of Liabilities	22.7
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Gross Amounts of Assets	2.6	14.7
Impact of Netting, Assets
Derivatives assets	2.6	14.7
All Other Amounts Subject to Master Netting Agreements, Assets	(0.5)	(3.5)
Potential Net Amounts of Assets	2.1	11.2
Gross Amounts of Liabilities	4.9
Impact of Netting, Liabilities
Derivatives liabilities	4.9
All Other Amounts Subject to Master Netting Agreements, Liabilities	(0.4)
Potential Net Amounts of Liabilities	$ 4.5