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Employee Benefit Plans - Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefit - Pension 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  
Defined Benefit Pension Plan [Member]      
Change in Projected Benefit Obligation During the Year:      
Beginning balance 547.2 527.4  
Service cost 0.0 0.0  
Interest cost 12.7 18.2 $ 16.3
Actuarial loss 42.4 49.4  
Benefits paid and plan expenses (47.1) (47.8)  
Ending balance 555.2 547.2 527.4
Change in Fair Value of Plan Assets During the Year:      
Beginning balance 425.6 381.6  
Actual return on plan assets 73.3 72.0  
Employer contributions 106.9 19.8  
Benefits paid and plan expenses (47.1) (47.8)  
Ending balance 558.7 425.6 $ 381.6
Funded status of plans 3.5 (121.6)  
Amounts recognized in Consolidated Balance Sheets      
Noncurrent asset 15.8    
Current liability 1.5 18.7  
Noncurrent liability 10.8 102.9  
Amounts recognized in Accumulated Other Comprehensive Loss      
Accumulated other comprehensive loss, net of tax of $51.4 million and $57.8 million, respectively [1] $ 163.3 $ 180.6  
[1] A cumulative effect adjustment of $30.8 million related to the adoption of ASC 2018-02 was recorded within accumulated other comprehensive loss, net of tax during the year ended December 31, 2019.