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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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May 31, 2017
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year ended May 31,
﻿In millions |  | 2017 |  | 2016 |  | 2015
﻿Beginning balance |  | $ | 29.2 |  | $ | 7.5 |  | $ | 21.5
﻿Other comprehensive (loss)/income: |  |  |  |  |  |  |  |  |
﻿Unrealized holding (losses)/gains |  |  | (14.7) |  |  | 34.2 |  |  | (21.5)
﻿Income tax benefit/(expense) related to unrealized holding (losses)/gains |  |  | 5.6 |  |  | (12.4) |  |  | 7.7
﻿Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income |  |  | (0.1) |  |  | (0.1) |  |  | (0.3)
﻿Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities |  |  | — |  |  | — |  |  | 0.1
﻿Total other comprehensive (loss)/income, net of tax |  |  | (9.2) |  |  | 21.7 |  |  | (14.0)
﻿Ending balance |  | $ | 20.0 |  | $ | 29.2 |  | $ | 7.5
﻿ |  |  |  |  |  |  |  |  |
﻿Total tax (benefit)/expense included in other comprehensive (loss)/income |  | $ | (5.6) |  | $ | 12.4 |  | $ | (7.8)
﻿

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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=66004124&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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