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Derivatives and Fair Value Measurements - Long-term debt (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt and Lease Obligation, Net | $ 338.5 | $ 334.2
Carrying amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt at par value | 345.1 | 342.3
Less: Unamortized debt issuance costs | (6.6) | (8.1)
Debt and Lease Obligation, Net | 338.5 | 334.2
Estimated fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair value | $ 501.3 | $ 483.9

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