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Short-term Financing (Narrative) (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 01, 2019 USD ($) | May 31, 2019 USD ($) | May 31, 2018 USD ($) | Aug. 17, 2017 USD ($) loan
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amounts outstanding |  | $ 0.0 | $ 0.0 |
Amount borrowed |  | $ 483.0 | $ 700.0 |
Number of days borrowed |  | 95 days | 22 days |
Weighted-average interest rate |  | 3.64% | 4.27% |
Weighted-average amount borrowed |  | $ 387.7 | $ 319.1 |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amount borrowed |  | $ 400.0 |  |
Number of days borrowed |  | 84 days |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member] | LIBOR [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Weighted-average interest rate |  | 3.45% |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Three Days [Member] |  |  |  |
Financing [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] |  |  |  |
Financing [Line Items] |  |  |  |
Weighted-average amount borrowed | $ 187.8 |  |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amounts outstanding |  | $ 0.0 | $ 0.0 |
Amount borrowed |  | $ 400.0 | $ 400.0 |
Number of days borrowed |  | 92 days | 42 days |
Weighted-average interest rate |  | 3.55% | 2.80% |
Weighted-average amount borrowed |  | $ 375.6 | $ 144.8 |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amount borrowed |  | $ 400.0 |  |
Number of days borrowed |  | 84 days |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member] | LIBOR [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Weighted-average interest rate |  | 3.45% |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seven Days [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amount borrowed |  |  | $ 300.0 |
Number of days borrowed |  |  | 7 days |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seven Days [Member] | LIBOR [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Weighted-average interest rate |  |  | 2.13% |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Thirty Days [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amount borrowed |  |  | $ 75.0 |
Number of days borrowed |  |  | 30 days |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Thirty Days [Member] | LIBOR [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Weighted-average interest rate |  |  | 2.19% |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Two Overnight Basis [Member] | Subsequent Event [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Weighted-average amount borrowed | 178.0 |  |  |
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amounts outstanding |  | $ 0.0 | $ 0.0 |
Amount borrowed |  | $ 58.9 | $ 59.9 |
Number of days borrowed |  | 359 days | 358 days |
Weighted-average interest rate |  | 2.81% | 1.94% |
Weighted-average amount borrowed |  | $ 56.1 | $ 57.2 |
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] | Subsequent Event [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Amounts outstanding | $ 54.9 |  |  |
Standby Letters of Credit [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Maximum borrowing capacity |  | 148.9 | 56.8 |
Amounts outstanding |  | $ 0.0 | 0.0 |
Standby Letters of Credit [Member] | Extended [Member] | Subsequent Event [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Expiration date | Jul. 01, 2020 |  |  |
Line of Credit [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Number of terminated lines of credit | loan |  |  |  | 4
Amounts outstanding |  |  | $ 0.0 |
Maximum borrowing capacity |  |  |  | $ 900.0
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Expiration date |  | Jul. 01, 2019 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |
Financing [Line Items] |  |  |  |
Expiration date |  | Jul. 01, 2020 |  |

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