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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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Amount of short-term and long-term debt and lease obligation.

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