Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Currency translation adjustment, tax		$ 1.0		$ 1.8
Amortization of pension related costs, net of tax benefit		(1.0)		(2.0)
Pension re-measurement, tax		7.2		30.1
Unrecognized loss on interest rate swap					1.7	[1]
Pension curtailment gain		0.2	[2]		1.5	[3]
Decrease in pension liabilities due to curtailment		1.7
Curtailment gain		1.5
Actuarial (Loss) Gain on Post-Retirement Benefits [Member]
Amortization of pension related costs, net of tax benefit		(1.0)		(2.0)
Pension re-measurement, tax		7.2		30.1
Unrecognized loss on interest rate swap						[1]
Pension curtailment gain		0.1	[2]		1.5	[3]
Reclassification adjustment related to deferred taxes on the amortization of actuarial losses	2.0
Foreign Currency Translation [Member]
Currency translation adjustment, tax		1.0		1.8
Unrecognized loss on interest rate swap						[1]
Pension curtailment gain			[2]			[3]
Prior Service Cost on Post-Retirement Benefits [Member]
Unrecognized loss on interest rate swap						[1]
Pension curtailment gain		0.1	[2]			[3]
Interest Rate Swap [Member]
Unrecognized loss on interest rate swap					0.8
Net settlement payment on Interest Rate Swap					$ 0.9

[1] Amounts related to "Deferred Loss - Hedging" in 2010 represent (1) the reclassification of an unrecognized loss of $0.8 million on the 2008 Interest Rate Swap prior to its expiration in April 2010 from Accumulated Other Comprehensive Loss into earnings due to the discontinuance of hedge accounting as a result of the 2010 refinancing of the 2006 bank term loan facility (see Note 12, "Financial Instruments") and (2) the reversal of amounts recorded in Accumulated Other Comprehensive Loss pertaining to the net settlement payment of $0.9 million on the 2008 Interest Rate Swap.

[2] As a result of the September 2012 Program, the Company recognized a curtailment gain of $1.7 million, partially offset by $0.1 million of accumulated actuarial losses and $0.1 million of prior service costs previously reported within Accumulated Other Comprehensive Loss, for a net gain of $1.5 million, which was recorded within restructuring charges for the year ended December 31, 2012. (See Note 15, "Savings Plan, Pension and Post-retirement Benefits").

[3] The Company recognized a $1.5 million curtailment gain in 2010, primarily in connection with the amendments to its Canadian defined benefit pension plan in 2010, which reduced pension liability and was recorded as an offset against the net actuarial losses previously reported within Accumulated Other Comprehensive Loss. (See Note 15, "Savings Plan, Pension and Post-retirement Benefits").