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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Feb. 29, 2016
Equity [Abstract] |
Changes in accumulated other comprehensive income | The changes in accumulated other comprehensive income are as follows:
|  | For the three months ended |  | For the nine months ended
In millions |  | February 29, 2016 |  | February 28, 2015 |  | February 29, 2016 |  | February 28, 2015
Beginning balance |  | $ | 20.3 |  |  | $ | 22.4 |  |  | $ | 7.5 |  |  | $ | 21.5 |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized gains/(losses) on available-for-sale securities, net of tax |  | 17.2 |  |  | (0.6 | ) |  | 30.0 |  |  | 0.4 |
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income, net of tax |  | — |  |  | — |  |  | — |  |  | (0.1 | )
Total other comprehensive income/(loss), net of tax |  | 17.2 |  |  | (0.6 | ) |  | 30.0 |  |  | 0.3 |
Ending balance |  | $ | 37.5 |  |  | $ | 21.8 |  |  | $ | 37.5 |  |  | $ | 21.8 |
Total tax expense included in other comprehensive income/(loss) |  | $ | 9.9 |  |  | $ | — |  |  | $ | 17.3 |  |  | $ | 0.2 |

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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=36458714&loc=SL7669686-108580 + Details
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