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Accumulated Other Comprehensive (Loss)/Income (Tables) | 9 Months Ended
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Feb. 28, 2019
Accumulated Other Comprehensive (Loss)/Income [Abstract] |
Changes in Accumulated Other Comprehensive Loss |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the three months ended |  | For the nine months ended
﻿ |  | February 28, |  | February 28,
﻿In millions |  | 2019 |  | 2018 |  | 2019 |  | 2018
﻿Beginning balance |  | $ | (47.4) |  | $ | (9.2) |  | $ | (36.2) |  | $ | 20.0
﻿Other comprehensive income/(loss): |  |  |  |  |  |  |  |  |  |  |  |
﻿Unrealized gains/(losses) on available-for-sale securities, net of tax |  |  | 27.4 |  |  | (17.5) |  |  | 22.2 |  |  | (46.7)
﻿Foreign currency translation adjustment |  |  | 0.7 |  |  | — |  |  | (5.3) |  |  | —
﻿Total other comprehensive income/(loss), net of tax |  |  | 28.1 |  |  | (17.5) |  |  | 16.9 |  |  | (46.7)
﻿Ending balance |  | $ | (19.3) |  | $ | (26.7) |  | $ | (19.3) |  | $ | (26.7)
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Total tax expense/(benefit) included in other comprehensive income/(loss) |  | $ | 9.1 |  | $ | (3.2) |  | $ | 6.8 |  | $ | (20.1)
﻿

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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