Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Details)

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Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Equity [Abstract]        
Accumulated other comprehensive income,Beginning balance $ 13.7 $ 39.7 $ 22.0 $ 37.7
Other comprehensive income/(loss):        
Unrealized gains/(losses) on available-for-sale securities, net of tax 11.0 (6.6) 2.9 (4.4)
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income, net of tax (0.1) (0.4) (0.3) (0.6)
Total other comprehensive income/(loss), net of tax 10.9 (7.0) 2.6 (5.0)
Accumulated other comprehensive income,Ending balance 24.6 32.7 24.6 32.7
Accumulated Other Comprehensive Income (Textual)        
Other comprehensive income/(loss), tax expense/(benefit) $ 6.5 $ (4.0) $ 1.7 $ (2.7)