Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v2.4.0.6
Fair Value of Financial Instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [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)
AFS Debt Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Cash proceeds in connection with early redemption of AFS debt securities   21.7 0 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   $ 3.2