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Derivatives and Fair Value Measurements - Long-term debt (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt at par value | $ 342.1 | $ 343.6
Net carrying amount | 333.6 | 333.8
Estimated fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair value | 506.2 | 560.0
Less: Unamortized debt issuance costs | (8.5) | (9.8)
Net carrying amount | $ 333.6 | $ 333.8

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