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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Apr. 23, 2019
Oct. 23, 2018
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Share Repurchase Plan          
Increase in authorized number of shares to be repurchased   5,000,000      
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan     7,000,000 7,000,000  
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)     10.00% 10.00%  
Share repurchases (in shares)       0  
Common Stock and Additional Paid-In (in Shares)          
Share repurchases (in shares)       0  
Share repurchases         $ 50.0
Common Stock and Additional Paid-In (in Amount)          
Stock options exercised       $ 0.8 $ 2.8
Dividends          
Common stock quarterly dividend per share (in dollars per share) $ 0.55     $ 0.55 $ 0.50
Common stock dividend quarterly declared and paid per share (in dollars per share)       $ 0.55 $ 0.50
Dividends paid       $ 37.0 $ 36.5
Common Stock and Additional Paid in Capital          
Common Stock and Additional Paid-In (in Shares)          
Payments made to tax authorities on employees' behalf       9.5 5.4
Common Stock and Additional Paid-In (in Amount)          
Stock options exercised       0.8 2.8
RSU's          
Dividends          
Dividend equivalents paid       $ 2.6 $ 2.0
Stock-Based Compensation          
Vesting period (in years)       3 years  
Changes          
Granted (in shares)     488,345    
RSU's | Performance-based          
Stock-Based Compensation          
Vesting period (in years)     3 years    
Changes          
Granted (in shares)     194,155    
Weighted Average Grant Date Fair Value          
Granted (in dollars per shares)     $ 88.05    
Unvested RSUs          
Changes          
Unvested at the beginning of the period (in shares)       889,830  
Granted (in shares)       488,345  
Vested (in shares)       (205)  
Cancelled or forfeited (in shares)       (1,670)  
Unvested at the end of the period (in shares)     1,376,300 1,376,300  
Shares reserved for future grants (all plans)     1,039,744 1,039,744  
Weighted Average Grant Date Fair Value          
Unvested at the beginning of the period (in dollars per share)       $ 82.05  
Granted (in dollars per shares)       88.05  
Vested (in dollars per shares)       81.28  
Cancelled or forfeited (in dollars per shares)       81.82  
Unvested at the end of the period (in dollars per shares)     $ 84.18 $ 84.18