Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive (Loss)/Income (Details)

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Accumulated Other Comprehensive (Loss)/Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Equity [Abstract]    
Accumulated other comprehensive (loss)/income, Beginning balance $ 22.0 $ 37.7
Other comprehensive loss:    
Unrealized losses on available-for-sale securities, net of tax (26.8) (0.3)
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income, net of tax (0.1) (0.1)
Total other comprehensive loss, net of tax (26.9) (0.4)
Accumulated other comprehensive (loss)/income, Ending balance (4.9) 37.3
Accumulated Other Comprehensive (Loss)/Income (Textual)    
Other comprehensive loss, Tax benefit $ (15.6) $ (0.3)