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Stock Based Compensation Plans (Nonvested Performance Share Unit Awards and Restricted Share Unit Awards - Rollforward) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, vested/released (in dollars per share) $ 161.04 $ 150.23 $ 117.53
Nonvested Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 664    
Granted (in shares) 169    
Vested/Released (in shares) (234)    
Forfeitures (in shares)    
Outstanding, ending balance (in shares) 599 664  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, beginning of period (in dollars per share) $ 130.08    
Weighted-average grant date fair value, granted (in dollars per share) 158.76    
Weighted-average grant date fair value, vested/released (in dollars per share) 141.82    
Weighted-average grant date fair value, forfeitures (in dollars per share)    
Weighted-average grant date fair value, end of period (in dollars per share) $ 133.59 $ 130.08  
Nonvested Restricted Share / Restricted Share Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 3,457    
Granted (in shares) 1,267    
Vested/Released (in shares) (1,030)    
Forfeitures (in shares) (112)    
Outstanding, ending balance (in shares) 3,582 3,457  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, beginning of period (in dollars per share) $ 137.73    
Weighted-average grant date fair value, granted (in dollars per share) 161.34    
Weighted-average grant date fair value, vested/released (in dollars per share) 147.92    
Weighted-average grant date fair value, forfeitures (in dollars per share) 144.87    
Weighted-average grant date fair value, end of period (in dollars per share) $ 142.94 $ 137.73