Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (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	Sep. 30, 2012 Foreign Currency Translation [Member]	Sep. 30, 2012 Actuarial (Loss) Gain On Post-Retirement Benefits [Member]		Sep. 30, 2012 Prior Service Cost On Post-Retirement Benefits [Member]	Dec. 31, 2011 Prior Service Cost On Post-Retirement Benefits [Member]
Beginning Balance			$ (200.9)			$ 24.8	$ (225.6)		$ (0.1)	$ (0.1)
Currency translation adjustment, net of tax of $0.7	(1.9)	(8.9)	0.3		(8.7)	0.3
Amortization of pension related costs, net of tax of $(0.7)	1.8	0.9	7.5	[1]	2.7		7.5	[1]
Other comprehensive income	(0.1)	(8.0)	7.8	[2]	(6.0)	0.3	7.5
Balance September 30, 2012	$ (193.1)		$ (193.1)			$ 25.1	$ (218.1)		$ (0.1)	$ (0.1)

[1] The amounts represent the change in accumulated other comprehensive loss as a result of the amortization of actuarial losses during the first nine months of 2012 related to the Company's pension and other post-retirement benefit plans. Also included in this amount is a $2.0 million reclassification adjustment recorded in the first quarter of 2012 related to deferred taxes on the amortization of actuarial losses.

[2] See Note 9, "Accumulated Other Comprehensive Loss," in this Form 10-Q regarding the changes in the accumulated balances for each component of accumulated other comprehensive loss during the first nine months of 2012.