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Derivatives and Fair Value Measurements - Fair Value of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value of Debt [Line Items]
Debt and Lease Obligation, Net	$ 348.1	$ 334.2
Carrying Amount
Fair Value of Debt [Line Items]
Total debt at par value	354.4	342.3
Less: Unamortized debt issuance costs	(6.3)	(8.1)
Debt and Lease Obligation, Net	348.1	334.2
Estimated Fair Value
Fair Value of Debt [Line Items]
Estimated fair value	$ 438.0	$ 483.9

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Fair Value of Debt [Line Items]

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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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