Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) - Asbestos Related Matters [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asbestos Related Contingencies [Line Items]
Asbestos provision, net(a)	[1]	$ 53.8	$ 56.5
Asbestos remeasurement, net		10.0	(76.4)
Settlement agreements and other		58.9
Continuing Operations [Member]
Asbestos Related Contingencies [Line Items]
Asbestos provision, net(a)	[1]	53.8	56.5	$ 59.0
Asbestos remeasurement, net		10.0	(76.4)	(81.8)
Settlement agreements and other		(58.9)		(2.8)
Asbestos-related expense (benefit), net		$ 4.9	$ (19.9)	$ (25.6)

[1] (a)Includes certain administrative costs such as legal-related costs for insurance asset recoveries.