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Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service costs $ 0.1 $ 0.2 $ 0.2
Interest costs 10.2 6.0 4.9
Amortization of net actuarial loss 2.0 5.8 6.8
Amortization of prior service cost (credit) 0.0 0.2 (1.3)
Net periodic costs $ 12.3 $ 12.2 $ 10.6