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Retirement Plans - Components of Estimated Net Periodic Benefit Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 11.7 $ 7.4 $ 6.2
Expected return on assets (13.2) (11.6) (14.2)
Amortization, net 1.0 3.3 3.8
Net pension plan income $ (0.5) $ (0.9) $ (4.2)
Weighted-average assumptions used to calculate net pension plan income:      
Discount rate 5.20% 2.90% 2.60%
Expected return on plan assets 5.80% 4.80% 6.00%