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Equity Incentive Plan Textuals (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 720.81 $ 595.31 $ 671.60
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share $ 8,900,000 9,600,000 8,700,000
Number of Shares Authorized for Stock Option Plan 2,000,000    
Options, Award Vesting Period 5 years    
Restricted Stock Units, Vesting Period 5 years    
Options, Grants in Period, Weighted Average Grant Date Fair Value $ 196.4 $ 189.78 $ 206.56
Options, Exercises in Period, Total Intrinsic Value $ 146.6 $ 74.3 $ 105.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 8.0 8.4 8.9
Restricted Stock Units, Vested in Period, Total Fair Value 7.0 7.2 6.8
Allocated Share-based Compensation Expense for Restricted Stock Units $ 7.1 $ 6.8 $ 6.5
Number of Shares Available for Grant 2,104,875    
Deferred Compensation Liability, Current and Noncurrent $ 52.1    
Estimated Weighted Average Amortization Period 2 years 3 months 18 days    
Performance Share Units Vesting Period 3 years    
Share Based Compensation Arrangements By Share Based Payment Award, Performance Options Grants in Period 12,678    
Performance Options Total Value of Grant $ 1.5    
Performance Share Unit Payout Percentage - Minimum 0.00%    
Performance Share Units Payout Percentage - Maximum 200.00%    
Performance Option Fair Value $ 803.26 $ 733.35 $ 844.39
Performance Share Unit Total Grant Value $ 3.6 $ 3.0  
Performance Share Payout Percentage 146.00%