Restructuring, Impairment and Other - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Restructuring And Related Activities [Abstract]
Employee termination costs	$ 1.5	$ 8.1
Other restructuring charges	$ 4.0	4.1
Gain on sale of previously impaired assets		$ 1.7

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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