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Accumulated Other Comprehensive (Loss)/Income (Tables) | 9 Months Ended
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Feb. 28, 2018
Accumulated Other Comprehensive (Loss)/Income [Abstract] |
Changes in Accumulated Other Comprehensive (Loss)/ Income |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the three months ended |  | For the nine months ended
﻿ |  | February 28, |  | February 28,
﻿In millions |  | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Beginning balance |  | $ | (9.2) |  | $ | (16.8) |  | $ | 20.0 |  | $ | 29.2
﻿Other comprehensive (loss)/income: |  |  |  |  |  |  |  |  |  |  |  |
﻿Unrealized (losses)/gains on available-for-sale securities, net of tax |  |  | (17.5) |  |  | 21.4 |  |  | (46.7) |  |  | (24.6)
﻿Total other comprehensive (loss)/income, net of tax |  |  | (17.5) |  |  | 21.4 |  |  | (46.7) |  |  | (24.6)
﻿Ending balance |  | $ | (26.7) |  | $ | 4.6 |  | $ | (26.7) |  | $ | 4.6
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Total tax (benefit)/expense included in other comprehensive income |  | $ | (3.2) |  | $ | 12.3 |  | $ | (20.1) |  | $ | (14.0)
﻿

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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=84228862&loc=SL7669686-108580 + Details
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