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Equity - Stock Repurchases and Dividends (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
May 09, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2017
$ / shares
Jun. 30, 2017
$ / shares
Mar. 31, 2017
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
$ / shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Stock repurchases                        
Amount authorized under new share repurchase plan $ 300.0                      
Common stock repurchased (in shares) | shares                   5.0 5.4 7.2
Aggregate repurchase price of common stock                   $ 300.0 $ 300.0 $ 400.0
Remaining repurchase amount   $ 150.0       $ 150.0       150.0 150.0  
Amount of share withholdings for option exercises                   $ 10.6 $ 15.8 $ 5.3
Common stock held in treasury | shares   5.1       18.0       5.1 18.0  
Dividends                        
Cash dividend paid (in dollars per share) | $ / shares   $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.16 $ 0.17 $ 0.17 $ 0.16 $ 0.72 $ 0.66 $ 0.60
Total dividend                   $ 44.7 $ 44.7 $ 44.5
Cash dividend paid                   $ 43.7 $ 43.4 $ 43.1
Treasury shares, stock split | shares                   16.5    
Distribution of treasury stock for stock split                   $ 0.0    
Common Stock                        
Dividends                        
Stock split, conversion ratio 2                      
Distribution of treasury stock for stock split                   (0.2)    
Additional Paid-in Capital                        
Dividends                        
Distribution of treasury stock for stock split                   (40.5)    
Retained Earnings                        
Dividends                        
Distribution of treasury stock for stock split                   (1,297.2)    
Treasury Stock                        
Dividends                        
Distribution of treasury stock for stock split                   1,337.9    
Boston Financial Data Services, Inc.                        
Stock repurchases                        
Aggregate repurchase price of common stock                   $ 3.7