Impact of Derivative Financial Instruments on Condensed Consolidated Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-tax Gain (Loss) Recognized in Earnings	$ 0.5	$ (1.9)	$ 1.3	$ (2.0)
Amount of Pre-tax (Loss) Recognized in OCI	(1.0)	(4.5)	(2.6)	(4.9)
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	(0.7)	0	(0.7)	(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	(1.0)	(4.5)	(2.6)	(4.9)
Amount of Pre-tax Loss Reclassified from AOCI into Earnings	(0.7)	0	(0.7)	(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
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	0.5	(2.0)	1.4	(2.0)
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