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Derivatives and Fair Value Measurements - Long-term debt (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net carrying amount	$ 335.6	$ 333.8
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt at par value	345.0	343.6
Less: Unamortized debt issuance costs	(9.4)	(9.8)
Net carrying amount	335.6	333.8
Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	$ 511.3	$ 560.0

X

- Definition

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

+ References

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-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
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-Subparagraph (SX 210.9-03.13,16)
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- Definition

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

+ References

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-Topic 470
-SubTopic 20
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Amount of long-term debt and lease obligation, including portion classified as current.

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- Definition

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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