Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) - Asbestos Related Matters [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Asbestos Related Contingencies [Line Items]
Asbestos provision, net(a)	[1]	$ 47.9	$ 53.8
Asbestos remeasurement, net		(68.1)	10.0
Settlement agreements and other		0.0	58.9
Continuing Operations [Member]
Asbestos Related Contingencies [Line Items]
Asbestos provision, net(a)	[1]	47.9	53.8	$ 56.5
Asbestos remeasurement, net		(68.1)	10.0	(76.4)
Settlement agreements and other		0.0	(58.9)	0.0
Asbestos-related (benefit) cost, net		$ (20.2)	$ 4.9	$ (19.9)

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