Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Changes in estimate during the period:
Asbestos-related liability		$ 86.0	$ 74.2
Asbestos-related assets		67.2	67.1
Noncurrent portion		731.6	775.1
Noncurrent Asbestos Related Assets		319.6	309.6
Asbestos Related Matters [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Net Balance, Beginning		472.6	508.5
Changes in estimate during the period:
Asbestos provision(a)	[1]	(47.9)	(53.8)
Asbestos remeasurement		(68.1)	10.0
Settlement Agreement		0.0	(58.9)
Net cash activity and other(a)	[1]	(21.6)	(40.8)
Balance, Ending			472.6
Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties		430.8	472.6
Asbestos Related Matters [Member] | Liability [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning		849.3	877.2
Changes in estimate during the period:
Asbestos provision(a)	[1]	(59.4)	(66.1)
Asbestos remeasurement		(4.5)	(5.8)
Settlement Agreement		0.0
Net cash activity and other(a)	[1]	(86.6)	(88.2)
Balance, Ending		817.6	849.3
Noncurrent portion			775.1
Asbestos Related Matters [Member] | Asset [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning		376.7	368.7
Changes in estimate during the period:
Asbestos provision(a)		11.5	12.3
Asbestos remeasurement		(63.6)	15.8
Settlement Agreement		0.0	(58.9)
Net cash activity and other(a)		65.0	47.4
Balance, Ending		$ 386.8	$ 376.7

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