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Employee Benefit Plans | Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 21.1 $ 12.7 $ 11.4
Weighted-average grant date fair value, Nonvested at January 31 $ 83.25    
Weighted-average grant date fair value, Granted $ 85.50 $ 92.08 $ 78.42
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 22.9    
Weighted-average grant date fair value, Vested $ 78.87    
Weighted-average grant date fair value, Canceled 86.10    
Weighted-average grant date fair value, Nonvested at January 31 $ 85.71 $ 83.25  
Nonvested at January 31 700,532    
Granted 280,352 454,480 222,095
Vested 267,591    
Canceled 64,171    
Nonvested at January 31 649,122 700,532  
Restricted Stock or Unit Expense $ 25.4 $ 25.8 $ 13.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months    
Restricted Stock Units (RSUs) [Member] | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Restricted Stock Units (RSUs) [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years