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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Feb. 28, 2017
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the three months ended |  | For the nine months ended
﻿ |  | February 28, |  | February 29, |  | February 28, |  | February 29,
﻿In millions |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Beginning balance |  | $ | (16.8) |  | $ | 20.3 |  | $ | 29.2 |  | $ | 7.5
﻿Other comprehensive income/(loss): |  |  |  |  |  |  |  |  |  |  |  |
﻿Unrealized gains/(losses) on available-for-sale securities, net of tax |  |  | 21.4 |  |  | 17.2 |  |  | (24.6) |  |  | 30.0
﻿Total other comprehensive income/(loss), net of tax |  |  | 21.4 |  |  | 17.2 |  |  | (24.6) |  |  | 30.0
﻿Ending balance |  | $ | 4.6 |  | $ | 37.5 |  | $ | 4.6 |  | $ | 37.5
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Total tax expense/(benefit) included in other comprehensive income |  | $ | 12.3 |  | $ | 9.9 |  | $ | (14.0) |  | $ | 17.3
﻿

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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=66004124&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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