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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Feb. 28, 2014
Equity [Abstract] |
Changes in accumulated other comprehensive income | The changes in accumulated other comprehensive income are as follows:
| For the three months ended February 28, |  | For the nine months ended February 28,
In millions | 2014 |  | 2013 |  | 2014 |  | 2013
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 | )
Ending balance | $ | 24.6 |  |  | $ | 32.7 |  |  | $ | 24.6 |  |  | $ | 32.7 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 + Details
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