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Long-Term Debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Debt Instrument [Line Items]      
Long-term debt $ 1,180.7 $ 1,179.5  
Outstanding letter of credit amount 3.3   $ 0.5
Revolving Credit Facility      
Debt Instrument [Line Items]      
Amount outstanding 0.0    
Revolving credit facility 750.0    
Senior Unsecured Notes 5.875 Percent Due 2022      
Debt Instrument [Line Items]      
Senior unsecured notes $ 1,200.0    
Debt, interest rate 5.875%    
Long-term debt $ 1,180.7