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Other Comprehensive (Loss)/Income (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2013 | May 31, 2012 | May 31, 2011
Other Comprehensive (Loss)/(Income): |  |  |
Unrealized holding (losses)/gains | $ (24.1) | $ 1.3 | $ (6.0)
Income tax benefit/(expense) related to unrealized holding (losses)/gains | 9.0 | (0.4) | 1.9
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income | (0.9) | (1.0) | (1.3)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities | 0.3 | 0.3 | 0.5
Other comprehensive (loss)/income | (15.7) | 0.2 | (4.9)
Other Comprehensive (Loss)/Income (Textual) |  |  |
Accumulated other comprehensive income | 22.0 | 37.7 |
Accumulated other comprehensive income, tax amount | $ 12.5 | $ 21.8 |

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