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Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service costs $ 0.1 $ 0.1 $ 0.2
Interest costs $ 9.6 $ 10.2 $ 6.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Expense, Operating and Nonoperating Interest Expense, Operating and Nonoperating Interest Expense, Operating and Nonoperating
Amortization of net actuarial loss $ 2.3 $ 2.0 $ 5.8
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction Interest Expense, Operating and Nonoperating
Amortization of prior service cost $ 0.0 $ 0.0 $ 0.2
Net periodic costs $ 12.0 $ 12.3 $ 12.2