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Employee Benefits - Restricted Stock and Performance Share Awards (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at December 31, 2019 0.7    
Granted 0.3    
Vested (0.2)    
Forfeited (0.2)    
Outstanding at December 31, 2020 0.6 0.7  
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Outstanding at December 31, 2019 $ 80.42    
Granted 83.64 $ 68.30 $ 88.76
Vested 73.15    
Forfeited 81.06    
Outstanding at December 31, 2019 $ 84.87 $ 80.42  
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at December 31, 2019 17.2    
Granted 10.8    
Vested (6.4)    
Forfeited (2.1)    
Outstanding at December 31, 2020 19.5 17.2  
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Outstanding at December 31, 2019 $ 70.08    
Granted 70.94 $ 64.31 $ 77.98
Vested 72.20    
Forfeited 70.66    
Outstanding at December 31, 2019 $ 69.80 $ 70.08  
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Payout percentage 0.00%    
Minimum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period 3 years    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Payout percentage 200.00%    
Maximum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period 4 years