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Debt (Details) (Credit Agreement, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 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 244.82   244.82  
Revolving loan
       
Revolving Line of Credit        
Amount outstanding 4.90   4.90  
Letter of credit
       
Revolving Line of Credit        
Amount outstanding $ 0.28   $ 0.28  
Minimum
       
Revolving Line of Credit        
Interest rate range during period (as a percent) 1.17% 1.59% 1.17% 1.59%
Maximum
       
Revolving Line of Credit        
Interest rate range during period (as a percent) 3.25% 4.00% 3.63% 4.00%