Other Current and Non-Current Assets - Components of Other Current and Non-Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020		Dec. 31, 2019
Asbestos-related assets(a)	$ 91.0	[1]	$ 67.2
Advance payments and other prepaid expenses	39.6		45.4
Contract assets	19.1		18.0
Prepaid income taxes	29.0		20.6
Other	10.8		2.2
Other current assets	189.5		153.4
Other employee benefit-related assets	113.9		133.6
Operating lease right-of-use assets	87.3		91.7
Capitalized software costs	23.9		30.1
Environmental-related assets	18.6
Equity method investments	11.7		9.8
Other	24.6		29.1
Other non-current assets	272.0		316.5
Other Noncurrent Assets [Member]
Environmental-related assets	$ 10.6		$ 22.2

[1] The increase in asbestos-related assets as of December 31, 2020 primarily relates to a 2020 settlement agreement with an insurer accelerating payments previously included in a buyout agreement. Refer to Note 20, Commitments and Contingencies, for further information.