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Debt (Details) (Credit Agreement, USD $)
In Millions, unless otherwise specified
3 Months Ended
May 31, 2014
May 31, 2013
Revolving Line of Credit    
Unsecured total revolving commitment $ 375  
Number of alternative methods under which interest on borrowings accrue 2  
Amount available for borrowings 139.70  
Revolving loan
   
Revolving Line of Credit    
Amount outstanding 235.00  
Letter of credit
   
Revolving Line of Credit    
Amount outstanding $ 0.30  
Minimum
   
Revolving Line of Credit    
Interest rate range during each year (as a percent) 1.90% 1.57%
Maximum
   
Revolving Line of Credit    
Interest rate range during each year (as a percent) 4.00% 3.63%