Impact of Derivative Financial Instruments on Condensed Consolidated Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	$ (0.1)	$ 1.0
Amount of Pre-tax (Loss) Recognized in OCI	0.3	(0.7)
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	(0.7)	0
Designated as Hedging Instrument | Interest rate swap contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	0	0
Amount of Pre-tax (Loss) Recognized in OCI	0	(0.7)
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	(0.7)	0
Designated as Hedging Instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	0	0
Amount of Pre-tax (Loss) Recognized in OCI	0.3	0
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	0	0
Not Designated as Hedging Instrument | Interest rate swap contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	0	(0.1)
Amount of Pre-tax (Loss) Recognized in OCI	0	0
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	0	0
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	(0.1)	1.1
Amount of Pre-tax (Loss) Recognized in OCI	0	0
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	$ 0	$ 0