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Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 65.6    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 14.42 $ 22.25 $ 29.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 2.4 $ 44.1 $ 39.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 7 months    
Allocated Share-based Compensation Expense $ 24.5 26.5 32.2
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 7.9 8.9 11.4
Performance Based Restricted Stock units (PSUs) [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 4.1 $ 8.1 10.2
Employee Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   8,700,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date   10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 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 $ 18.0 $ 27.7 $ 26.5
Directors Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   1,000,000  
Reduction In Authorized Shares For Every Share Delivered To Stock Based Compensation Award   1.58  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date   10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee   25,000  
Executive Officer [Member] | Performance Based Restricted Stock units (PSUs) [Member]      
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  
Executive Officer [Member] | 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, Award Vesting Period   3 years  
Other Management Employees [Member] | 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, Award Vesting Rights, Percentage   25.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years  
Director [Member] | 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, Award Vesting Period   1 year