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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year $ 4.1 $ 3.7 $ 3.3
Charge (credit) to Expense 0.8 1.7 0.8
Write-off of Receivables and Divestitures (0.5) (1.4) (0.1)
Other (0.3) 0.1 (0.3)
Balance, End of Year 4.1 4.1 3.7
Deferred Income Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year 6.6 7.9 23.9
Charge (credit) to Expense 3.2 0.8 (15.3)
Write-off of Receivables and Divestitures (0.6) (2.3) 0.0
Other (0.3) 0.2 (0.7)
Balance, End of Year $ 8.9 $ 6.6 $ 7.9