Impact of Derivative Financial Instruments on Condensed Consolidated Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	$ (0.2)	$ (0.3)	$ 0.8	$ (0.1)
Amount of Pre-tax (Loss) Recognized in OCI	(0.9)	(0.2)	(1.6)	(0.4)
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	0	(3.7)	0	(5.0)
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	0	0
Amount of Pre-tax (Loss) Recognized in OCI	(0.9)	(0.2)	(1.6)	(0.4)
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	0	(3.7)	0	(5.0)
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)	(0.1)	(0.1)
Amount of Pre-tax (Loss) Recognized in OCI	0	0	0	0
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	0	0	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	(0.2)	(0.2)	0.9	0
Amount of Pre-tax (Loss) Recognized in OCI	0	0	0	0
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	$ 0	$ 0	$ 0	$ 0