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Short-term Financing (Credit Facility Amount Borrowed) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 6 days | 13 days
Maximum amount borrowed | $ 394.5 | $ 660.0
Weighted-average amount borrowed | $ 216.3 | $ 278.8
Weighted-average interest rate | 4.99% | 4.23%
JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 4 days |
Maximum amount borrowed | $ 223.0 |
Weighted-average amount borrowed | $ 133.4 |
Weighted-average interest rate | 4.99% | 0.00%
PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days borrowed | 88 days | 88 days
Maximum amount borrowed | $ 56.8 | $ 57.2
Weighted-average amount borrowed | $ 56.0 | $ 55.8
Weighted-average interest rate | 2.53% | 1.67%

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- Definition Line of Credit Facility, Number Of Days Borrowed + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
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- Details
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- Details
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- Details
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- Details
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Period Type: |