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Fair Value Measurements (Tables) | 3 Months Ended
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Aug. 31, 2019
Fair Value Measurements [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis |
|  | August 31, 2019
|  |  |  |  | Quoted |  | Significant |  |  |
|  |  |  |  | prices in |  | other |  | Significant
|  | Carrying |  | active |  | observable |  | unobservable
|  | value |  | markets |  | inputs |  | inputs
In millions |  | (Fair value) |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Restricted and unrestricted cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 258.9 |  | $ | — |  | $ | 258.9 |  | $ | —
Time deposits |  |  | 215.5 |  |  | — |  |  | 215.5 |  |  | —
U.S. government agency securities |  |  | 271.0 |  |  | — |  |  | 271.0 |  |  | —
Money market securities |  |  | 20.5 |  |  | 20.5 |  |  | — |  |  | —
Total restricted and unrestricted cash equivalents |  | $ | 765.9 |  | $ | 20.5 |  | $ | 745.4 |  | $ | —
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | 26.6 |  | $ | — |  | $ | 26.6 |  | $ | —
Corporate bonds |  |  | 698.5 |  |  | — |  |  | 698.5 |  |  | —
General obligation municipal bonds |  |  | 789.1 |  |  | — |  |  | 789.1 |  |  | —
Pre-refunded municipal bonds |  |  | 23.6 |  |  | — |  |  | 23.6 |  |  | —
Revenue municipal bonds |  |  | 521.3 |  |  | — |  |  | 521.3 |  |  | —
U.S. government agency and treasury securities |  |  | 978.7 |  |  | — |  |  | 978.7 |  |  | —
Variable rate demand notes |  |  | 35.0 |  |  | — |  |  | 35.0 |  |  | —
Total available-for-sale securities |  | $ | 3,072.8 |  | $ | — |  | $ | 3,072.8 |  | $ | —
Other |  | $ | 30.1 |  | $ | 30.1 |  | $ | — |  | $ | —
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  | $ | 29.2 |  | $ | 29.2 |  | $ | — |  | $ | —
|  | May 31, 2019
|  |  |  |  | Quoted |  | Significant |  |  |
|  |  |  |  | prices in |  | other |  | Significant
|  | Carrying |  | active |  | observable |  | unobservable
|  | value |  | markets |  | inputs |  | inputs
In millions |  | (Fair value) |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Restricted and unrestricted cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 10.0 |  | $ | — |  | $ | 10.0 |  | $ | —
Money market securities |  |  | 29.2 |  |  | 29.2 |  |  | — |  |  | —
Total restricted and unrestricted cash equivalents |  | $ | 39.2 |  | $ | 29.2 |  | $ | 10.0 |  | $ | —
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | 5.3 |  | $ | — |  | $ | 5.3 |  | $ | —
Corporate bonds |  |  | 446.5 |  |  | — |  |  | 446.5 |  |  | —
General obligation municipal bonds |  |  | 847.8 |  |  | — |  |  | 847.8 |  |  | —
Pre-refunded municipal bonds |  |  | 25.8 |  |  | — |  |  | 25.8 |  |  | —
Revenue municipal bonds |  |  | 549.9 |  |  | — |  |  | 549.9 |  |  | —
U.S. government agency and treasury securities |  |  | 615.9 |  |  | — |  |  | 615.9 |  |  | —
Variable rate demand notes |  |  | 1,129.6 |  |  | — |  |  | 1,129.6 |  |  | —
Total available-for-sale securities |  | $ | 3,620.8 |  | $ | — |  | $ | 3,620.8 |  | $ | —
Other |  | $ | 27.7 |  | $ | 27.7 |  | $ | — |  | $ | —
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  | $ | 27.0 |  | $ | 27.0 |  | $ | — |  | $ | —
Financial Liabilities Measured at Fair Value on Non-Recurring Basis |
|  | August 31, 2019 |  | May 31, 2019
|  | Amortized |  | Fair |  | Amortized |  | Fair
In millions |  | cost |  | value |  | cost |  | value
Long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Series A |  | $ | 400.0 |  | $ | 432.7 |  | $ | 400.0 |  | $ | 418.4
Senior Notes, Series B |  |  | 400.0 |  |  | 441.6 |  |  | 400.0 |  |  | 420.1
Total long-term borrowings |  |  | 800.0 |  |  | 874.3 |  |  | 800.0 |  |  | 838.5
Less: Debt issuance costs, net of accumulated amortization |  |  | (3.5) |  |  | (3.5) |  |  | (3.6) |  |  | (3.6)
Long-term borrowings, net of debt issuance costs |  | $ | 796.5 |  | $ | 870.8 |  | $ | 796.4 |  | $ | 834.9

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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