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Derivatives and Fair Value Measurements - Fair Value of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value of Debt [Line Items]
Total debt at par value	$ 1,137.8	$ 1,547.8
Carrying Amount
Fair Value of Debt [Line Items]
Total debt at par value	1,173.2	1,591.3
Less: Unamortized debt issuance costs and original issue discount	(35.4)	(43.5)
Net carrying amount	1,137.8	1,547.8
Estimated Fair Value
Fair Value of Debt [Line Items]
Estimated fair value	$ 1,136.5	$ 987.6

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[Line Items] for Fair Value of Debt [Table]

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

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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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