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Short-term Financing (Credit Facility Amount Borrowed) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 4 days | 6 days | 10 days | 19 days
Maximum amount borrowed | $ 483.0 | $ 700.0 | $ 483.0 | $ 700.0
Weighted-average amount borrowed | $ 389.8 | $ 445.8 | $ 285.7 | $ 331.6
Weighted-average interest rate | 5.12% | 4.25% | 5.06% | 4.24%
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 | 20 days | 7 days | 20 days
Maximum amount borrowed | $ 135.5 | $ 400.0 | $ 223.0 | $ 400.0
Weighted-average amount borrowed | $ 83.0 | $ 215.8 | $ 111.8 | $ 215.8
Weighted-average interest rate | 5.25% | 2.84% | 5.07% | 2.84%
PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of days borrowed | 91 days | 91 days | 179 days | 179 days
Maximum amount borrowed | $ 57.7 | $ 58.6 | $ 57.7 | $ 58.6
Weighted-average amount borrowed | $ 57.3 | $ 57.8 | $ 56.6 | $ 56.8
Weighted-average interest rate | 2.68% | 1.78% | 2.61% | 1.73%

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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 Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- 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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- Details
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