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Employee Benefit Plans and Postretirement Benefits - Additional Information (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]          
Expense on defined contribution plan     $ 188.0 $ 188.0 $ 198.0
Increase (decrease) in benefit obligation $ (550.0) $ (431.0)     4.3
Plan assets transferred from plan 550.0 451.0      
Pre-tax non-cash settlement charge $ 125.0 $ 116.0      
Plan amendments     $ 527.0    
Amortization period of deferred reduction to retirement benefits payable     4 years 6 months    
Amortization of benefits modification     $ 119.0 119.0 80.0
Decrease due to benefit obligations of new mortality table     7.8 14.0 3.6
Pension plans          
Defined Benefit Plan Disclosure [Line Items]          
Pre-tax non-cash settlement charge     125.0 125.0 1.0
Plan amendments     2.0 (2.0)  
Total accumulated benefit obligation     2,627.0 2,915.0  
Decrease due to benefit obligations of new mortality table     8.6 11.0 3.0
Employer contributions     66.0    
Healthcare plans          
Defined Benefit Plan Disclosure [Line Items]          
Pre-tax non-cash settlement charge     0.0 0.0 0.0
Plan amendments     1.0 (47.0)  
Decrease due to benefit obligations of new mortality table     (0.8) 3.0 0.6
Employer contributions     21.0    
Other          
Defined Benefit Plan Disclosure [Line Items]          
Pre-tax non-cash settlement charge     2.0 2.0 $ 1.0
Plan amendments     0.0 $ 0.0  
Employer contributions     $ 30.0