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Equity Based Compensation (Disclosure of Share-based Compensation Arrangements by Share-based Payment Award) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Grants in Period, Weighted Average Exercise Price $ 129.01 $ 117.85 $ 145.25
Options, Outstanding, Intrinsic Value $ 28.7    
Options, Exercisable, Intrinsic Value $ 28.7    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Number, Beginning Balance 291,129    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 167,862    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 0    
Forfeited (997)    
Outstanding, Number, Ending Balance 340,405 [1] 291,129  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Grants in Period, Weighted Average Exercise Price $ 129.01    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period (117,589)    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Number, Beginning Balance 76,390    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 328,491    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (18,487)    
Forfeited (6,506)    
Outstanding, Number, Ending Balance 379,888 [1] 76,390  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period 0    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Number, Beginning Balance 2,168,395    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 200,239    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (144,042)    
Forfeited (1,878)    
Outstanding, Number, Ending Balance 2,222,714 2,168,395  
Options exercisable 1,800,569    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Outstanding, Weighted Average Exercise Price, Beginning of Period $ 102.30    
Options, Grants in Period, Weighted Average Exercise Price 129.01    
Exercised / Lapsed 60.47    
Forfeited 129.01    
Options, Outstanding, Weighted Average Exercise Price, End of Period 107.39 $ 102.30  
Options exercisable $ 103.30    
[1] Amount outstanding at December 31, 2021, includes the amount of shares to be issued under RSUs expected to vest and number of shares to be issued under performance continent awards at target performance. The amount of shares do not reflect potential increases or decreases that may result from the performance factor results except for the 2019 – 2021 grants which vested as of December 31, 2021.