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SCHEDULE II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 2.4 $ 1.6 $ 1.1
Charged to Costs and Expenses 2.4 1.9 1.0
Charged to Other Accounts [1] 0.0 0.0 0.0
Deductions [2] (1.9) (1.1) (0.5)
Balance at End of Year 2.9 2.4 1.6
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 8.2 9.4 10.6
Charged to Costs and Expenses 0.1 (0.8) 0.0
Charged to Other Accounts [1] 0.5 (0.4) (1.2)
Deductions [2] 0.0 0.0 0.0
Balance at End of Year $ 8.8 $ 8.2 $ 9.4
[1] epresents amounts recognized in Accumulated other comprehensive loss and other adjustments that had no net impact on Income tax expense in the year.
[2] Represents amounts written off, net of related recoveries.