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Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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May 31, 2011
Other Comprehensive (Loss) Income (Tables) [Abstract] |
Other Comprehensive Income |
|  | Year ended May 31, |
In millions |  | 2011 |  |  | 2010 |  |  | 2009 |
Unrealized holding (losses)/gains |  | $ | (6.0 | ) |  | $ | 3.1 |  |  | $ | 43.0 |
Income tax benefit/(expense) related to unrealized holding (losses)/gains |  |  | 1.9 |  |  |  | (0.6 | ) |  |  | (16.4 | )
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income |  |  | (1.3 | ) |  |  | (3.2 | ) |  |  | (1.1 | )
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities |  |  | 0.5 |  |  |  | 1.2 |  |  |  | 0.4 |
Other comprehensive (loss)/income |  | $ | (4.9 | ) |  | $ | 0.5 |  |  | $ | 25.9 |

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