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Operations and Significant Accounting Policies - Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Customer Deposits	$ 6.0	$ 150.7
PSAs	6.0	6.1
Provision for Interim Rate Refund	39.4	18.4
Manufactured Gas Plant - Current	3.4	14.7
Operating Lease Liabilities	3.0	3.2
Finance Lease Liabilities	0.4	0.0
Other	52.3	57.9
Total Other Current Liabilities	$ 110.5	$ 251.0

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- Definition

Manufactured Gas Plant - Current

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The fair value adjustment for the price of power per MW at market rates compared to those at contract rate at the time of acquisition through the end of the contract term present valued to acquisition date resulting in a current liability.

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Public Utilities Reserve for Interim Rates

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.

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