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Derivatives and Fair Value Measurements - Long-term debt (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net carrying amount | $ 334.5 | $ 333.8
Carrying amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt at par value | 343.5 | 343.6
Less: Unamortized debt issuance costs |  | (9.8)
Net carrying amount | 334.5 | 333.8
Estimated fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair value | $ 454.8 | $ 560.0

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