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Equity Based Compensation (Narrative) (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 [Line Items]      
Document Period End Date Dec. 31, 2021    
Options, Exercises in Period, Total Intrinsic Value $ 8.0 $ 15.0 $ 31.0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 8 months 12 days    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 21.0    
Share-based Payment Arrangement, Expense $ 55.0 $ (12.0) $ 39.0
Options, Grants in Period, Weighted Average Exercise Price $ 129.01 $ 117.85 $ 145.25
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 144,042    
Expiration Period 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 200,239    
Options, Grants in Period, Weighted Average Exercise Price $ 129.01    
Flexible Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Of Shares Available For Grant 16,460,077    
Flexible Stock Plan For Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Of Shares Available For Grant 462,500    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 167,862    
Options, Grants in Period, Weighted Average Exercise Price $ 129.01    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 18,487    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 328,491