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Trade and Other Receivables, Net - Activity Related to Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]      
Balance at beginning of year $ 2.4 $ 1.3 $ 1.3
Provision for doubtful accounts 2.0 3.2 0.7
Charge-offs, net of recoveries (1.3) (2.1) (0.7)
Balance at end of year $ 3.1 $ 2.4 $ 1.3