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Stock Compensation Plans - RSU and PSU activity (Details) - $ / shares
shares in Millions
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Non-vested at beginning of period (in shares) 0.6    
Granted (in shares) 0.3    
Vested (in shares) (0.2)    
Forfeited (in shares) (0.1)    
Non-vested at end of period (in shares) 0.6 0.6  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted-Average Grant-Date Fair Value Roll Forward [Roll Forward]      
Non-vested at beginning of period (in usd per share) $ 81.12    
Granted (in usd per share) 103.40 $ 91.69 $ 67.46
Vested (in usd per share) 103.47    
Forfeited (in usd per share) 88.57    
Non-vested at end of period (in usd per share) $ 88.49 $ 81.12  
Performance Based Restricted Stock units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Non-vested at beginning of period (in shares) 0.5    
Granted (in shares) 0.2    
Vested (in shares) (0.1)    
Forfeited (in shares) (0.1)    
Non-vested at end of period (in shares) 0.5 0.5  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested, Weighted-Average Grant-Date Fair Value Roll Forward [Roll Forward]      
Non-vested at beginning of period (in usd per share) $ 84.85    
Granted (in usd per share) 85.26 $ 108.99 $ 79.23
Vested (in usd per share) 84.16    
Forfeited (in usd per share) 83.46    
Non-vested at end of period (in usd per share) $ 85.30 $ 84.85