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Derivatives (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 26, 2023 | Jan. 25, 2023 | Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Derivatives, Fair Value [Line Items] |  |  |  |  |
Net broker receivable |  |  | $ 15,000,000 |  | $ 10,900,000
Initial margin |  |  | 5,700,000 |  | $ 5,700,000
Variation margin |  |  | $ 9,300,000 | $ 5,200,000 |
Senior Notes | 5.625% senior unsecured notes due 2024 |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Repayments of long term debt | $ 24,800,000 | $ 316,300,000 |  |  |

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