Commitments and Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) - Environmental Related Matters [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Environmental Liability and Related Assets [Roll Forward]
Environmental liability - Beginning balance		$ 82.2	$ 82.9
Environmental liability - Ending balance		69.8	82.2
Accruals added during the period for new matters, Net		0.0	0.1
Net cash activity, Net		(11.4)	(12.3)
Accruals added during the period for new matters, Net		(0.6)	(0.5)
Liability [Member]
Environmental Liability and Related Assets [Roll Forward]
Environmental liability - Beginning balance		89.9	94.6
Accruals added during the period for new matters, Liability			0.1
Net cash activity, Liability		(12.1)	(12.6)
Foreign currency, Liability		(0.6)	(0.5)
Environmental liability - Ending balance		82.6	89.9
Asset [Member]
Environmental Liability and Related Assets [Roll Forward]
Environmental liability - Asset, Beginning balance		7.7	11.7
Accruals added during the period for new matters, Assets		0.0	0.0
Net cash activity, Asset		(0.7)	(0.3)
Foreign currency, Asset		0.0	0.0
Environmental liability - Asset, Ending balance		12.8	7.7
Additions [Member]
Environmental Liability and Related Assets [Roll Forward]
Continuing Operation, Net	[1]	4.3	14.9
Additions [Member] | Liability [Member]
Environmental Liability and Related Assets [Roll Forward]
Continuing operations, Liability		11.0	11.2
Additions [Member] | Asset [Member]
Environmental Liability and Related Assets [Roll Forward]
Continuing operations, Asset		6.7	(3.7)
Reversal [Member]
Environmental Liability and Related Assets [Roll Forward]
Continuing Operation, Net	[1]	(4.7)	(2.9)
Reversal [Member] | Liability [Member]
Environmental Liability and Related Assets [Roll Forward]
Continuing operations, Liability		(5.6)	$ (2.9)
Reversal [Member] | Asset [Member]
Environmental Liability and Related Assets [Roll Forward]
Continuing operations, Asset		$ (0.9)

[1] (a)Changes in estimates for pre-existing accruals includes environmental-related costs of $0.1 and $2.7 reported within results of discontinued operations for the years ended December 31, 2015 and 2014, respectively.