Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) - Asbestos Related Matters [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Asbestos Related Contingencies [Line Items]
Asbestos provision, net(a)	[1]	$ 14.4		$ 30.8
Asbestos remeasurement, net(b)		0.0	[2]	135.9
Settlement agreements and other		0.0		100.4
Continuing Operations [Member]
Asbestos Related Contingencies [Line Items]
Asbestos provision, net(a)	[1]	14.4		30.8	$ 47.9
Gain on divestiture before income tax		(88.8)
Asbestos remeasurement, net(b)		0.0	[2]	135.9	(68.1)
Settlement agreements and other		0.0		(100.4)	0.0
Asbestos-related (benefit) costs, net		$ (74.4)		$ 66.3	$ (20.2)

[1] 2021 includes costs related to the divestiture of InTelCo as well as certain administrative costs such as legal-related costs for insurance asset recoveries. 2020 included amounts to maintain a rolling 10-year provision prior to the transition in 2020 to full horizon.

[2] In 2020, we extended our projection to include pending claims and claims expected to be filed through 2052, which reflected the full time period over which we expected asbestos-related claims to be filed against InTelCo.