Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details 2)

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Fair Value of Financial Instruments (Details 2) (AFS Debt Securities [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
AFS Debt Securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation      
Balance as of March 1   $ 28.5 $ 40.8
Total net gains      
Included in earnings (interest expense, net)   3.7 4.5
Included in other comprehensive income (net unrealized losses on AFS debt securities)   1.1 1.5
Total net gains   4.8 6.0
Settlements (21.7) 0 (21.7)
Balance as of the end of the period $ 25.1 $ 33.3 $ 25.1