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Short-term Financing (Narrative) (Details) - USD ($) $ in Millions |  |  |  | 5 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2025 | Apr. 12, 2024 | Apr. 11, 2024 | May 31, 2025 | May 31, 2025 | Jan. 31, 2025 | Jan. 07, 2025 | May 31, 2024
JP Morgan Chase Bank, N.A. [Member] | Interest Rate Swaption [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Aggregate notional amount |  |  |  |  |  | $ 3,000.0 |  |
Swaption contract assets, premium paid |  |  |  |  |  | $ 19.2 |  |
2019 Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,000.0 |  |  |  |  |  |
Term of unsecured line of credit facility |  | 5 years |  |  |  |  |  |
Expiration date |  | Apr. 12, 2029 | Jul. 31, 2024 |  |  |  |  |
2017 Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 750.0 |  |  |  |  |  |
Term of unsecured line of credit facility |  | 5 years |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 2,000.0 | $ 2,000.0 |  |  |
Standby Letters of Credit [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 165.0 | 165.0 |  |  | $ 168.5
Amounts outstanding |  |  |  | 0.0 | $ 0.0 |  |  | $ 0.0
Standby Letters of Credit [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Renewal term | 1 year |  |  |  |  |  |  |
Bridge Loan Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 3,500.0 |
Debt financing fees, including structuring and commitment fees |  |  |  | $ 14.9 |  |  |  |
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, 2025 |  |  |
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 |  |  |  |  | Feb. 28, 2027 |  |  |

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