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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Aug. 31, 2017
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | For the three months ended
﻿ |  | August 31,
﻿In millions |  | 2017 |  | 2016
﻿Beginning balance |  | $ | 20.0 |  | $ | 29.2
﻿Other comprehensive income: |  |  |  |  |  |
﻿Unrealized gains on available-for-sale securities, net of tax |  |  | 4.4 |  |  | 10.0
﻿Total other comprehensive income, net of tax |  |  | 4.4 |  |  | 10.0
﻿Ending balance |  | $ | 24.4 |  | $ | 39.2
﻿ |  |  |  |  |  |
﻿Total tax expense included in other comprehensive income |  | $ | 2.4 |  | $ | 5.7
﻿

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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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