Commitments and Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) - Environmental Related Matters [Member] - Liability [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Environmental Liability and Related Assets [Roll Forward]
Balance as of January 1	$ 58.3	$ 61.9
Changes in estimates for pre-existing accruals:
Accruals added during the period for new matters	(1.8)	0.0
Net cash activity	(7.6)	(3.7)
Foreign currency	(0.2)	(0.2)
Balance as of December 31	54.1	58.3
Continuing Operations [Member]
Changes in estimates for pre-existing accruals:
Continuing operations	1.8	1.4
Discontinued operations	(1.8)	(1.4)
Discontinued Operations [Member]
Changes in estimates for pre-existing accruals:
Continuing operations	0.0	1.5
Discontinued operations	$ 0.0	$ (1.5)