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Short-term Financing (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2021 | Mar. 17, 2016 | May 31, 2021 | May 31, 2020
Revolving Credit Facility [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,700.0 |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Maximum borrowing capacity | [1] |  |  | $ 1,000.0 |
Expiration date | [1] |  |  | Jul. 31, 2024 |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Maximum borrowing capacity | [1] |  |  | $ 500.0 |
Expiration date | [1] |  |  | Aug. 17, 2022 |
Revolving Credit Facility [Member] | PNC $250 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Maximum borrowing capacity | [2] |  |  | $ 250.0 |
Expiration date | [2] |  |  | Feb. 06, 2023 |
Weighted-average interest rate |  |  |  | 1.16% |
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 150.0 |  |
Term |  |  | 4 years |  |
Expiration date |  |  | Feb. 06, 2020 |  |
Standby Letters of Credit [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 180.4 | $ 147.9
Expiration date |  |  |  | Jun. 26, 2021 |
Amounts outstanding |  |  |  | $ 0.0 | $ 0.0
Standby Letters of Credit [Member] | Subsequent Event [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Expiration date |  | Jun. 26, 2022 |  |  |
Letter of credit cancelled |  | $ 41.2 |  |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Commitment fee, percentage |  |  |  | 0.05% |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Expiration date |  |  |  | Jun. 26, 2021 |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Commitment fee, percentage |  |  |  | 0.15% |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Financing [Line Items] |  |  |  |  |
Expiration date |  |  |  | Jul. 15, 2022 |
[1] |
|  |  |  | Maximum |  | Amount Outstanding
|  |  |  | Amount |  | May 31,
$ in millions |  | Expiration Date |  | Available |  | 2021 |  | 2020
Credit facilities: |  |  |  |  |  |  |  |  |  |  |
JP Morgan Chase Bank, N.A. ("JPM") (1) |  | July 31, 2024 |  | $ | 1,000.0 |  | $ | — |  | $ | —
JPM (1) |  | August 17, 2022 |  | $ | 500.0 |  |  | — |  |  | —
PNC Bank, National Association (“PNC”) (weighted-average interest rate of 1.16% at May 31, 2021 (2) |  | February 6, 2023 |  | $ | 250.0 |  |  | 7.4 |  |  | 5.1
Outstanding short-term financing (3) |  |  |  |  |  |  | $ | 7.4 |  | $ | 5.1
(1)JPM acts as the administrative agent for this syndicated credit facility.
[2] | This agreement replaced the Company’s predecessor four year unsecured $150.0 million credit facility dated March 17, 2016, which was terminated on February 6, 2020.

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