Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Changes in estimate during the period:
Asbestos-related liabilities (see Note 20)		$ 0.0		$ 91.4
Asbestos-related assets (See Note 20)		0.0		91.0
Noncurrent portion		0.0		840.6
Noncurrent Asbestos Related Assets		0.0		353.7
Asbestos Related Matters [Member]
Changes in estimate during the period:
Asbestos provision, net(a)	[1]	14.4		30.8
Asbestos remeasurement		0.0	[2]	135.9
Settlement Agreement		0.0		(100.4)
Net cash activity and other(a)	[1]	(14.9)		(9.8)
DivestitureOfLegacyAsbestosAssetsAndLiabilities		(486.8)
Net Balance, Ending		0.0		487.3		$ 430.8
Asbestos Related Matters [Member] | Liability [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning		0.0		932.0		817.6
Changes in estimate during the period:
Asbestos provision, net(a)	[1]	13.4		37.1
Asbestos remeasurement		0.0	[2]	155.7
Settlement Agreement		0.0
Net cash activity and other(a)	[1]	(57.2)		(78.4)	[2]
DivestitureOfLegacyAsbestosAssetsAndLiabilities		888.2
Noncurrent portion				840.6
Asbestos Related Matters [Member] | Asset [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning		0.0		444.7		$ 386.8
Changes in estimate during the period:
Asbestos provision, net(a)		1.0		6.3
Asbestos remeasurement		0.0		19.8
Settlement Agreement		0.0		(100.4)
Net cash activity and other(a)		42.3		$ 68.6
DivestitureOfLegacyAsbestosAssetsAndLiabilities		$ 401.4

[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.