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Short-term Financing (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 01, 2018 | Aug. 31, 2018 | Aug. 31, 2017 | May 31, 2018
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amounts outstanding |  | $ 0.0 |  | $ 0.0
Amount borrowed |  | $ 394.5 | $ 660.0 |
Number of days borrowed |  | 6 days | 13 days |
Weighted-average interest rate |  | 4.99% | 4.23% |
Weighted-average amount borrowed |  | $ 216.3 | $ 278.8 |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Three Days [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed |  |  | $ 100.0 |
Number of days borrowed |  |  | 3 days |
Weighted-average interest rate |  |  | 4.25% |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Two Overnight Basis [Member] | Subsequent Event [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted-average amount borrowed | $ 417.0 |  |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amounts outstanding |  | 0.0 |  | 0.0
Amount borrowed |  | $ 223.0 |  |
Number of days borrowed |  | 4 days |  |
Weighted-average interest rate |  | 4.99% | 0.00% |
Weighted-average amount borrowed |  | $ 133.4 |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Overnight Basis [Member] | Subsequent Event [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed | $ 135.5 |  |  |
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amounts outstanding |  | 56.7 |  | 0.0
Amount borrowed |  | $ 56.8 | $ 57.2 |
Number of days borrowed |  | 88 days | 88 days |
Weighted-average interest rate |  | 2.53% | 1.67% |
Weighted-average amount borrowed |  | $ 56.0 | $ 55.8 |
Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity |  | 61.8 |  | 56.8
Amounts outstanding |  | $ 0.0 | $ 0.0 | $ 0.0
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration Date |  | Nov. 01, 2018 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration Date |  | Jul. 01, 2020 |  |

X
- Definition Line of Credit Facility, Number Of Days Borrowed + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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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 Date the credit facility terminates, in CCYY-MM-DD format. + 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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- 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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- 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 borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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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