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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year $ 2.9 $ 2.1 $ 1.8
Expense (income) (0.3) 1.0 0.1
Write-off of Receivables and Divestitures (0.7) (0.2) (0.2)
Other 0.1 0.0 0.4
Balance, End of Year 2.0 2.9 2.1
Deferred Income Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year 10.7 8.9 6.6
Expense (income) (8.1) 2.3 2.6
Other 0.1 (0.5) (0.3)
Balance, End of Year $ 2.7 $ 10.7 $ 8.9