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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Allowance for credit losses [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 1.4 $ 1.5 $ 1.2
Additions Charged to Costs & Expenses 0.5 0.3 0.4
Deductions (0.3) (0.4) (0.1)
Balance at End of Period 1.6 1.4 1.5
Deferred tax asset valuation allowance [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 31.7 28.0 44.5
Additions Charged to Other Accounts (2.4) 3.7 (16.5)
Balance at End of Period $ 29.3 $ 31.7 $ 28.0