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Short-term Financing (Credit Facility Amount Borrowed) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 2 days | 8 days | 21 days | 27 days
Maximum amount borrowed | $ 200.0 | $ 250.0 | $ 700.0 | $ 350.0
Weighted-average amount borrowed | $ 125.0 | $ 81.3 | $ 311.9 | $ 183.3
Weighted-average interest rate | 4.25% | 2.24% | 4.24% | 2.68%
JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 19 days |  | 39 days |
Maximum amount borrowed | $ 75.0 |  | $ 400.0 |
Weighted-average amount borrowed | $ 75.0 |  | $ 147.2 |
Weighted-average interest rate | 2.19% |  | 2.69% |
PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 90 days | 90 days | 269 days | 267 days
Maximum amount borrowed | $ 59.9 | $ 55.6 | $ 59.9 | $ 55.6
Weighted-average amount borrowed | $ 59.1 | $ 55.3 | $ 57.6 | $ 52.6
Weighted-average interest rate | 2.01% | 1.27% | 1.83% | 1.13%

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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