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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Total | $ 1,873.8 |
Recorded Amount |  |
Derivative [Line Items] |  |
Variable rate debt | 573.8 | $ 288.8
Fixed rate debt | 1,300.0 | 800.0
Total | 1,873.8 | 1,088.8
Fair Value |  |
Derivative [Line Items] |  |
Variable rate debt | 573.8 | 288.8
Fixed rate debt | 1,182.2 | 717.7
Total | $ 1,756.0 | $ 1,006.5

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