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Short-term Financing (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 USD ($) loan | Feb. 28, 2017 USD ($) loan | Feb. 29, 2016 USD ($) | May 31, 2016 USD ($)
PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration date |  | Feb. 28, 2018 |  |
Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Number of lines of credit | loan | 4 | 4 |  |
Amounts outstanding | $ 0.0 | $ 0.0 |  |
Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | 46.8 | 46.8 |  | $ 43.0
Amounts outstanding | 0.0 | 0.0 |  |
Revolving Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amounts outstanding | 55.4 | $ 55.4 |  | $ 0.0
Expiration term |  | 3 years |  |
Maximum borrowing capacity | 150.0 | $ 150.0 |  |
Expiration date |  | Mar. 17, 2019 |  |
Maximum amount borrowed | $ 55.6 | $ 55.6 |  |
Number of days borrowed | 90 days | 267 days |  |
Weighted-average interest rate | 1.27% | 1.13% |  |
Revolving Credit Facility [Member] | JP Morgan Chase Bank, NA [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration term |  | 5 years |  |
Maximum borrowing capacity | $ 1,000.0 | $ 1,000.0 |  |
Expiration date |  | Aug. 05, 2020 |  |
Maximum amount borrowed | $ 250.0 | $ 350.0 | $ 350.0 |
Number of days borrowed | 8 days | 27 days | 3 days |
Weighted-average interest rate | 2.24% | 2.68% | 3.25% |
Amounts outstanding | $ 0.0 | $ 0.0 |  |
Revolving Credit Facility [Member] | JP Morgan Chase Bank, NA [Member] | Eight Days [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum amount borrowed | $ 50.0 |  |  |
Number of days borrowed | 8 days |  |  |
Revolving Credit Facility [Member] | JP Morgan Chase Bank, NA [Member] | Eight Days [Member] | LIBOR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted-average interest rate | 1.44% |  |  |
Revolving Credit Facility [Member] | JP Morgan Chase Bank, NA [Member] | Seven Days [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum amount borrowed |  | $ 150.0 |  |
Number of days borrowed |  | 7 days |  |
Revolving Credit Facility [Member] | JP Morgan Chase Bank, NA [Member] | Eighteen Days [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum amount borrowed |  | $ 50.0 |  |
Number of days borrowed |  | 18 days |  |
Revolving Credit Facility [Member] | JP Morgan Chase Bank, NA [Member] | Eight And Eighteen Days [Member] | LIBOR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted-average interest rate |  | 1.40% |  |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration date |  | Apr. 01, 2017 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration date |  | Dec. 01, 2017 |  |

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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://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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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