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Short-term Financing (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 21, 2017 USD ($) | Nov. 30, 2017 USD ($) | Nov. 30, 2016 USD ($) | Nov. 30, 2017 USD ($) | Nov. 30, 2016 USD ($) | Aug. 17, 2017 USD ($) loan | May 31, 2017 USD ($)
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 |  |  | $ 0.0
Maximum amount borrowed |  | $ 700.0 | $ 350.0 | $ 700.0 | $ 350.0 |  |
Number of days borrowed |  | 6 days | 15 days | 19 days | 19 days |  |
Weighted-average interest rate |  | 4.25% | 2.53% | 4.24% | 2.74% |  |
Weighted-average amount borrowed |  | $ 445.8 | $ 223.3 | $ 331.6 | $ 226.3 |  |
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] |  |  |  |  |  |  |
Maximum 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] | Seven Days [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum amount borrowed |  |  |  |  | $ 150.0 |  |
Number of days borrowed |  |  |  |  | 7 days |  |
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [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] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seven And Eighteen Days [Member] | LIBOR [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  | 1.39% |  |
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 | $ 125.0 |  |  |  |  |  |
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 |  | 75.0 |  | $ 75.0 |  |  |
Expiration Date |  |  |  | Dec. 01, 2017 |  |  |
Maximum amount borrowed |  | $ 400.0 |  | $ 400.0 |  |  |
Number of days borrowed |  | 20 days |  | 20 days |  |  |
Weighted-average interest rate |  | 2.84% |  | 2.84% |  |  |
Weighted-average amount borrowed |  | $ 215.8 |  | $ 215.8 |  |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seven Days [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum 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] |  |  |  |  |  |  |
Line of Credit Facility [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] | Eleven Days [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum amount borrowed |  | $ 75.0 |  |  |  |  |
Number of days borrowed |  | 11 days |  |  |  |  |
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eleven Days [Member] | LIBOR [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate |  | 2.19% |  |  |  |  |
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amounts outstanding |  | $ 58.4 |  | 58.4 |  |  | 0.0
Maximum amount borrowed |  | $ 58.6 | $ 53.1 | $ 58.6 | $ 53.1 |  |
Number of days borrowed |  | 91 days | 91 days | 179 days | 177 days |  |
Weighted-average interest rate |  | 1.78% | 1.08% | 1.73% | 1.05% |  |
Weighted-average amount borrowed |  | $ 57.8 | $ 52.2 | $ 56.8 | $ 51.8 |  |
Standby Letters of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 52.8 |  | 52.8 |  |  | 47.3
Amounts outstanding |  | 0.0 | 0.0 | 0.0 | 0.0 |  | $ 0.0
Standby Letters of Credit [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 4.1 |  |  |  |  |  |
Expiration Date | Nov. 30, 2018 |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Number of terminated lines of credit | loan |  |  |  |  |  | 4 |
Amounts outstanding |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |
Maximum borrowing capacity |  |  |  |  |  | $ 900.0 |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Expiration Date |  |  |  | Apr. 01, 2018 |  |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Expiration Date |  |  |  | Dec. 01, 2018 |  |  |

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