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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 294 Months Ended
Jul. 25, 2018
Oct. 20, 2015
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Share Repurchase Plan                
Increase in authorized number of shares to be repurchased   7,500,000            
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan       7,500,000   7,500,000   7,500,000
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%   10.00%
Share repurchases (in shares)               23,100,000
Average costs per share               $ 32.94
Common Stock and Additional Paid-In (in Shares)                
Share repurchases (in shares)               23,100,000
Dividends                
Common stock quarterly dividend per share (in dollars per share) $ 0.50              
Common stock dividend quarterly declared and paid per share (in dollars per share)       $ 0.50 $ 0.45 $ 1.00 $ 0.90  
Dividends paid       $ 36.1 $ 32.8 $ 72.6 $ 65.6  
RSU changes                
Unvested at the beginning of the period (in shares)           924,575    
Granted (in shares)           474,715    
Vested (in shares)           (3,362)    
Cancelled or forfeited (in shares)           (13,318)    
Unvested at the end of the period (in shares)       1,382,610   1,382,610   1,382,610
Shares reserved for future grants (all plans)       1,368,824   1,368,824   1,368,824
Weighted Average Grant Date Fair Value                
Unvested at the beginning of the period (in dollars per share)           $ 74.09    
Granted (in dollars per shares)           84.26    
Vested (in dollars per shares)           71.72    
Cancelled or forfeited (in dollars per shares)           74.93    
Unvested at the end of the period (in dollars per shares)       $ 77.58   $ 77.58   $ 77.58
Common Stock and Additional Paid in Capital                
Share Repurchase Plan                
Share repurchases (in shares)           (592,564)    
Average costs per share           $ 84.38    
Value of shares repurchased           $ 50.0    
Common Stock and Additional Paid-In (in Shares)                
Stock-based compensation ( in shares)       15,574   285,007    
Stock options exercised (in shares)           48,275    
Share repurchases (in shares)           (592,564)    
Total ( in shares)       15,574   (259,282)    
Stock-based compensation expense           $ 19.3    
Payments made to tax authorities on employees' behalf           5.4    
Common Stock and Additional Paid-In (in Amount)                
Stock-based compensation       $ 12.9   13.9    
Stock options exercised           2.8    
Repurchase of common shares           (50.0)    
Total       $ 12.9   $ (33.3)    
Weighted Average Exercise/(Purchase) Price                
Stock options exercised (in dollars per share)           $ 57.91    
RSU's                
Dividends                
Dividend equivalents paid           $ 2.0 $ 0.9  
Stock-Based Compensation                
Vesting period (in years)           3 years    
RSU changes                
Granted (in shares)     474,715          
RSU's | Performance-based                
RSU changes                
Granted (in shares)     178,970