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Debt (Details) (Credit Agreement, USD $)
In Millions, unless otherwise specified
3 Months Ended
May 31, 2013
May 31, 2012
Revolving Line of Credit    
Unsecured total revolving commitment $ 250.00  
Number of alternative methods under which interest on borrowings accrue 2  
Amount available for borrowings 211.69  
Revolving loan
   
Revolving Line of Credit    
Amount outstanding 38.00  
Letter of credit
   
Revolving Line of Credit    
Amount outstanding $ 0.31  
Minimum
   
Revolving Line of Credit    
Interest rate range during period (as a percent) 1.57% 1.61%
Maximum
   
Revolving Line of Credit    
Interest rate range during period (as a percent) 3.63% 4.00%