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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 20, 2020
May 20, 2020
Oct. 23, 2018
Mar. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Share Repurchase Plan                        
Increase in authorized number of shares to be repurchased     5,000,000.0                  
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan         3,100,000           3,100,000  
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan, expressed as a percentage of outstanding shares (as a percent)         5.00%           5.00%  
Share repurchases (in shares)         2,466     0     3,300,000 600,000
Average costs per share         $ 100.00           $ 90.10 $ 84.33
Value of shares repurchased         $ 0.2   $ 300.0   $ 50.0   $ 300.2 $ 50.0
Dividends                        
Common stock quarterly dividend per share (in dollars per share) $ 0.625       $ 0.625 $ 0.625 $ 0.625 $ 0.55 $ 0.55 $ 0.55    
Common stock dividend quarterly declared and paid per share (in dollars per share)         $ 0.625     $ 0.55     $ 1.875 $ 1.65
Dividends paid         $ 39.8     $ 36.7     $ 120.7 $ 110.6
Directors Equity Plan                        
Stock-Based Compensation                        
Extension period of plan   10 years                    
Common Stock and Additional Paid in Capital                        
Share Repurchase Plan                        
Value of shares repurchased         $ 0.2   $ 119.3   $ 50.0      
Common Stock and Additional Paid-In (in Shares)                        
Payments made to tax authorities on employees' behalf                     14.9 9.6
RSU's                        
Dividends                        
Dividend equivalents paid                     $ 2.1 $ 2.7
Stock-Based Compensation                        
Vesting period (in years)                     3 years  
RSU's | Service-based                        
Stock-Based Compensation                        
Vesting period (in years)       3 years                
Changes                        
Granted (in shares)       330,144                
Weighted Average Grant Date Fair Value                        
Granted (in dollars per share)       $ 82.81                
RSU's | Performance-based                        
Stock-Based Compensation                        
Vesting period (in years)       3 years                
Changes                        
Granted (in shares)       210,403                
Weighted Average Grant Date Fair Value                        
Granted (in dollars per share)       $ 82.81                
Unvested RSUs                        
Stock-Based Compensation                        
Increase in number of shares available for issuance under the plan (in shares)   1,500,000                    
Changes                        
Unvested at the beginning of the year (in shares)             859,005       859,005  
Granted (in shares)                     540,547  
Vested (in shares)                     (4,925)  
Cancelled or forfeited (in shares)                     (25,466)  
Unvested at the end of the period (in shares)         1,369,161           1,369,161  
Shares reserved for future grants (all plans)         2,104,770           2,104,770  
Weighted Average Grant Date Fair Value                        
Unvested at the beginning of the year (in dollars per share)             $ 86.40       $ 86.40  
Granted (in dollars per share)                     82.81  
Vested (in dollars per share)                     85.40  
Cancelled or forfeited (in dollars per share)                     85.39  
Unvested at the end of the period (in dollars per share)         $ 85.01           $ 85.01