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Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service costs $ 0.1 $ 0.1 $ 0.1 $ 0.1
Interest costs 2.5 1.5 7.6 4.5
Amortization of net actuarial loss 0.4 1.4 1.5 4.3
Amortization of prior service cost 0.0 0.0 0.0 0.2
Net periodic costs $ 3.0 $ 3.0 $ 9.2 $ 9.1