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Defined Benefit Plans - Obligations and Funded Status (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in the Projected Benefit Obligation (PBO):      
Recognition of actuarial losses (gains) $ 3.2 $ 34.1 $ 3.8
Change in Plan Assets:      
Beginning balance 677.2    
Ending balance 784.9 677.2  
Pension Benefits [Member]      
Change in the Projected Benefit Obligation (PBO):      
Projected benefit obligation at beginning of year 877.1 763.2  
Service cost 0.4 0.4  
Interest cost 28.3 32.9  
Recognition of actuarial losses (gains) 70.6 121.6  
Benefits paid (42.9) (41.0)  
Projected benefit obligation at end of year 933.5 877.1 763.2
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases) 933.5 877.1  
Change in Plan Assets:      
Beginning balance 677.2 599.6  
Actual return on plan assets 101.3 106.8  
Employer contributions 49.3 11.8  
Benefits paid (42.9) (41.0)  
Ending balance 784.9 677.2 599.6
Funded status (Fair value of plan assets less PBO) (148.6) (199.9)  
Postretirement Benefits [Member]      
Change in the Projected Benefit Obligation (PBO):      
Projected benefit obligation at beginning of year 3.6 1.4  
Projected benefit obligation acquired [1] 9.6    
Service cost 0.4 0.2  
Interest cost 0.2 0.2  
Plan amendments   1.6  
Recognition of actuarial losses (gains) 0.2 1.0  
Benefits paid (0.6) (0.7)  
Curtailment gain   (0.1)  
Projected benefit obligation at end of year 13.4 3.6 $ 1.4
Change in Plan Assets:      
Employer contributions 0.6 0.7  
Benefits paid (0.6) (0.7)  
Funded status (Fair value of plan assets less PBO) $ (13.4) $ (3.6)  
[1] Related to the Larson acquisition discussed in Note 4.