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Accumulated Other Comprehensive (Loss)/Income (Tables) | 6 Months Ended
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Nov. 30, 2016
Accumulated Other Comprehensive (Loss)/Income [Abstract] |
Changes in Accumulated Other Comprehensive (Loss)/Income |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the three months ended, |  | For the six months ended
﻿ |  | November 30, |  | November 30,
﻿In millions |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿Beginning balance |  | $ | 39.2 |  | $ | 13.8 |  | $ | 29.2 |  | $ | 7.5
﻿Other comprehensive (loss)/income: |  |  |  |  |  |  |  |  |  |  |  |
﻿Unrealized (losses)/gains on available-for-sale securities, net of tax |  |  | (56.0) |  |  | 6.5 |  |  | (46.0) |  |  | 12.8
﻿Total other comprehensive (loss)/ income, net of tax |  |  | (56.0) |  |  | 6.5 |  |  | (46.0) |  |  | 12.8
﻿Ending balance |  | $ | (16.8) |  | $ | 20.3 |  | $ | (16.8) |  | $ | 20.3
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Total tax (benefit)/expense included in other comprehensive income |  | $ | (32.0) |  | $ | 3.8 |  | $ | (26.3) |  | $ | 7.4
﻿

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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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