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Short-term Financing (Narrative) (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2020 | Mar. 17, 2016 | Aug. 05, 2015 | May 31, 2020 | May 31, 2019
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,800.0 |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,000.0 | $ 1,000.0 | [1],[2] |
Term |  |  |  | 5 years |  |  |
Expiration date |  |  |  | Jul. 31, 2019 | Jul. 31, 2024 | [1],[2] |
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 | [3] |  |  |  | $ 250.0 |  |
Expiration date | [3] |  |  |  | Feb. 06, 2023 |  |
Revolving Credit Facility [Member] | PNC $250 Million Credit Facility [Member] | PNC Bank, National Association [Member] | Two Overnight Basis [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |
Weighted-average amount borrowed |  | $ 89.5 |  |  |  |  |
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 |  |  |  |  | $ 147.9 |  | $ 148.9
Amounts outstanding |  |  |  |  | $ 0.0 |  | $ 0.0
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. 01, 2020 |  |
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 |  |  |  |  | Jan. 01, 2022 |  |
[1] | JPM acts as the administrative agent for this syndicated credit facility.
[2] | This agreement replaced the Company’s predecessor five-year unsecured $1.0 billion credit facility dated August 5, 2015, which was terminated on July 31, 2019.
[3] | 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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