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Regulatory Matters: Regulatory Matters (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Regulatory assets	$ 431,100,000	$ 480,100,000
Regulatory assets, current	(147,300,000)	(175,700,000)
Regulatory assets, non-current	283,800,000	304,400,000
Regulatory liabilities	553,400,000	566,600,000
Regulatory liabilities, current	(89,900,000)	(98,900,000)
Regulatory liabilities, non-current	463,500,000	467,700,000
Deferred energy and gas costs
Regulatory liabilities	85,700,000	88,900,000
Employee benefit plan costs and related deferred taxes
Regulatory liabilities	35,700,000	36,200,000
Cost of removal
Regulatory liabilities	182,200,000	181,900,000
Excess deferred income taxes
Regulatory liabilities	243,200,000	247,100,000
Other regulatory liabilities
Regulatory liabilities	6,600,000	12,500,000
Storm Costs
Regulatory assets	144,900,000	199,600,000
Deferred energy and gas costs
Regulatory assets	57,500,000	55,100,000
Deferred gas cost adjustments
Regulatory assets	8,100,000	4,100,000
Gas price derivatives
Regulatory assets	0	5,100,000
Deferred taxes on AFUDC
Regulatory assets	7,400,000	7,100,000
Employee benefit plans and related deferred taxes
Regulatory assets	88,200,000	89,300,000
Environmental
Regulatory assets	5,900,000	2,900,000
Loss on reacquired debt
Regulatory assets	17,000,000	17,400,000
Deferred taxes on flow through accounting
Regulatory assets	80,500,000	74,700,000
Decommissioning costs
Regulatory assets	2,400,000	2,400,000
Other regulatory assets
Regulatory assets	$ 19,200,000	$ 22,400,000

X

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

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-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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