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Employee Benefit Plans - Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefit - Postretirement Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in Consolidated Balance Sheets      
Noncurrent liability $ 24.4 $ 117.2  
Other Postretirement Benefits Plan [Member]      
Change in Benefit Obligation:      
Beginning balance 15.4 16.8  
Interest cost 0.3 0.5 $ 0.5
Participant contributions 0.3 0.4  
Actuarial gain   (0.7)  
Benefits paid (1.9) (1.6)  
Ending balance 14.1 15.4 16.8
Change in Plan Assets:      
Beginning balance 0.0 0.0  
Company contributions 1.6 1.2  
Participant contributions 0.3 0.4  
Benefits paid (1.9) (1.6)  
Ending balance   0.0 $ 0.0
Funded status of plans (14.1) (15.4)  
Amounts recognized in Consolidated Balance Sheets      
Current liability 1.9 2.1  
Noncurrent liability 12.2 13.3  
Amounts recognized in Accumulated Other Comprehensive Loss      
Accumulated other comprehensive income, net of tax of $(5.4) million and $(6.1) million, respectively [1] $ (8.6) $ (10.4)  
[1] A cumulative effect adjustment of $3.3 million related to the adoption of ASU 2018-02 was recorded within accumulated other comprehensive income, net of tax during the year ended December 31, 2019