Quarterly report pursuant to Section 13 or 15(d)

Investments (Details Textual 1)

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Investments (Details Textual 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Schedule of Investments [Line Items]        
Cash proceeds from principal in connection with early redemption of AFS debt securities     $ 0 $ 20.2
Reclassification from AOCI of gains (losses) on AFS debt securities 0 (3.2) 0 (3.2)
Accolade [Member]
       
Schedule of Investments [Line Items]        
Investment ownership description     less than 20%  
Investment income, Dividend 0 0 0 0
Interest income on AFS debt securities 1.3 1.4 3.7 4.5
Cash proceeds in connection with early redemption of AFS debt securities   21.7    
Cash proceeds from principal in connection with early redemption of AFS debt securities   20.2    
Cash proceeds from interest in connection with early redemption of AFS debt securities   1.5    
Reclassification from AOCI of gains (losses) on AFS debt securities   $ 3.2    
Contractual maturity of AFS debt securities     Jan. 31, 2023