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Accumulated Other Comprehensive (Loss)/Income (Tables) | 6 Months Ended
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Nov. 30, 2017
Changes in Accumulated Other Comprehensive (Loss)/ Income |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the three months ended |  | For the six months ended
﻿ |  | November 30, |  | November 30,
﻿In millions |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Beginning balance |  | $ | 24.4 |  | $ | 39.2 |  | $ | 20.0 |  | $ | 29.2
﻿Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
﻿Unrealized losses on available-for-sale securities, net of tax |  |  | (33.6) |  |  | (56.0) |  |  | (29.2) |  |  | (46.0)
﻿Total other comprehensive loss, net of tax |  |  | (33.6) |  |  | (56.0) |  |  | (29.2) |  |  | (46.0)
﻿Ending balance |  | $ | (9.2) |  | $ | (16.8) |  | $ | (9.2) |  | $ | (16.8)
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Total tax benefit included in other comprehensive loss |  | $ | (19.3) |  | $ | (32.0) |  | $ | (16.8) |  | $ | (26.3)
﻿

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration