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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. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed |  | 71 days | 16 days | 81 days
Maximum amount borrowed |  | $ 400.0 | $ 694.0 | $ 483.0
Weighted-average amount borrowed |  | $ 400.0 | $ 357.1 | $ 385.9
Weighted-average interest rate |  | 3.48% | 5.09% | 3.66%
JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 3 days | 71 days | 27 days | 78 days
Maximum amount borrowed | $ 273.0 | $ 400.0 | $ 450.0 | $ 400.0
Weighted-average amount borrowed | $ 168.2 | $ 400.0 | $ 323.4 | $ 374.1
Weighted-average interest rate | 4.75% | 3.48% | 3.30% | 3.57%
PNC $250 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 91 days |  | 270 days |
Maximum amount borrowed | $ 141.3 |  | $ 141.3 |
Weighted-average amount borrowed | $ 52.3 |  | $ 53.8 |
Weighted-average interest rate | 2.55% |  | 2.79% |
PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed |  | 90 days |  | 269 days
Maximum amount borrowed |  | $ 58.9 |  | $ 58.9
Weighted-average amount borrowed |  | $ 57.7 |  | $ 57.0
Weighted-average interest rate |  | 2.94% |  | 2.72%

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- Details
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- Details
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- Details
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- Details
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