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Pension - Schedule of Change in Projected Benefit Obligations (Detail) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Projected Benefit Obligations      
Projected benefit obligations at beginning of year $ 247.6 $ 335.7  
Service cost 0.7 1.2 $ 1.5
Interest cost 13.6 9.8 9.0
Actuarial loss (gain) 12.9 (77.6)  
Benefits paid (16.3) (15.9)  
Curtailments (0.3) (1.0)  
Plan combination (acquisitions/divestitures) 0.0 (3.9)  
Other 0.5 (0.7)  
Projected benefit obligations at end of year $ 258.7 $ 247.6 $ 335.7