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Shareholders' Equity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Statement [Line Items]        
Purchase for treasury $ 500.0 $ 4,400.0 $ 4,150.0  
Preferred stock, shares authorized (in shares) 5,000,000.0      
Shares issued (in shares) 0 0    
Shares held in employee trust (in shares) 50,000,000.0 50,000,000.0    
Employee benefit trust $ 3,013.2 $ 3,013.2    
2018 Repurchase Program        
Statement [Line Items]        
Remaining authorized repurchase amount $ 1,000.0      
Stock repurchase program, authorized amount       $ 8,000.0