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Debt (Details) (Credit Agreement, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Revolving Line of Credit        
Unsecured total revolving commitment $ 250.00   $ 250.00  
Number of alternative methods under which interest on borrowings accrue     2  
Amount available for borrowings 226.19   226.19  
Revolving loan
       
Revolving Line of Credit        
Amount outstanding 23.50   23.50  
Letter of credit
       
Revolving Line of Credit        
Amount outstanding $ 0.31   $ 0.31  
Minimum
       
Revolving Line of Credit        
Interest rate range during period (as a percent) 1.18% 1.61% 1.18% 1.61%
Maximum
       
Revolving Line of Credit        
Interest rate range during period (as a percent) 3.63% 3.63% 3.63% 4.00%