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Equity - Stock repurchases and dividends (Details)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Oct. 27, 2017
$ / shares
May 09, 2017
USD ($)
Mar. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2016
USD ($)
Oct. 31, 2017
USD ($)
Stock repurchases and dividends [Line Items]            
Stock Repurchased During Period, Shares | shares       3.8    
Stock Repurchased During Period, Value       $ 225.0    
Stock Repurchase Program, Authorized Amount   $ 300.0        
Share receipts and withholding amount from option exercise and restricted stock vesting       10.4 $ 15.7  
Dividends, common stock       34.0 33.8  
Cash dividends paid       $ 33.0 32.8  
Treasury shares, stock split | shares       16.5    
Distribution of treasury stock for stock split       $ 0.0    
Subsequent Event [Member]            
Stock repurchases and dividends [Line Items]            
Stock Repurchased, Remaining Authorized Repurchase Amount           $ 202.5
Cash dividends declared (in dollars per share) | $ / shares $ 0.18          
Boston Financial Data Services, Inc.            
Stock repurchases and dividends [Line Items]            
Stock Repurchased During Period, Value     $ 3.7      
Treasury Stock            
Stock repurchases and dividends [Line Items]            
Distribution of treasury stock for stock split       1,337.9    
Common Stock            
Stock repurchases and dividends [Line Items]            
Stock split, conversion ratio   2        
Distribution of treasury stock for stock split       (0.2)    
Additional Paid-in Capital            
Stock repurchases and dividends [Line Items]            
Cash dividends paid       1.0 1.0  
Distribution of treasury stock for stock split       (40.5)    
Retained Earnings            
Stock repurchases and dividends [Line Items]            
Cash dividends paid       34.0 $ 33.8  
Distribution of treasury stock for stock split       $ (1,297.2)