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Stockholders' Equity Stock Repurchase Program (Details) - USD ($)
$ in Millions
Oct. 31, 2016
Jan. 31, 2016
2014 Program [Member]    
Share Repurchase [Line Items]    
Stock Repurchase Program, Authorized Amount   $ 300.0
2016 Program [Member]    
Share Repurchase [Line Items]    
Stock Repurchase Program, Authorized Amount $ 500.0  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 313.3