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Deferred Compensation Additional Information (Details) - USD ($)
$ in Millions
Oct. 31, 2017
Jan. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Marketable securities $ 693.0  
Rabbi Trust Member    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Deferred compensation liability 56.5 $ 47.3
Deferred compensation liability current 3.8 3.1
Deferred compensation liability non-current $ 52.7 $ 44.2