Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Activities
Net Income	$ 140.3	$ 118.6	$ 87.2
Adjustments to reconcile net income to net operating cash:
Depreciation and amortization	91.7	65.7	65.5
Depreciation and accretion included in operations expenses	15.9	15.8	11.9
Deferred income taxes and investment tax credits	28.8	36.4	3.4
Realized gains on sale of assets/commodity contracts	(10.6)	(4.4)	(0.8)
Unrealized gains on investments/commodity contracts	(2.1)	(1.8)	(1.9)
Employee benefits and compensation	0.0	0.0	0.3
Share-based compensation	8.5	8.4	7.6
Changes in assets and liabilities:
Accounts receivable and accrued revenue	(37.1)	(10.3)	2.3
Propane inventory, storage gas and other inventory	(0.6)	3.3	0.3
Regulatory assets/liabilities, net	(18.4)	0.2	20.1
Prepaid expenses and other current assets	(1.4)	0.4	18.7
Accounts payable and other accrued liabilities	13.3	0.4	(16.8)
Income taxes receivable/payable	7.9	(2.9)	(1.3)
Customer deposits and refunds	(0.6)	(0.7)	3.9
Accrued compensation	(2.9)	7.0	1.5
Other assets and liabilities, net	(3.6)	5.7	(2.3)
Net cash provided by operating activities	233.7	239.4	203.5
Investing Activities
Property, plant and equipment expenditures	(448.6)	(355.3)	(188.6)
Proceeds from sale of assets	12.9	5.2	2.9
Acquisitions, net of cash acquired	0.0	0.6	(925.0)
Environmental expenditures	0.0	(0.4)	(0.7)
Net cash used in investing activities	(435.7)	(349.9)	(1,111.4)
Financing Activities
Common stock dividends	(60.7)	(54.2)	(40.0)
Payment, Tax Withholding, Share-based Payment Arrangement	(1.0)	(1.5)	(2.5)
Change in cash overdrafts due to outstanding checks	0.4	1.5	(0.3)
Net borrowings (repayments) under line of credit agreements	(39.4)	14.1	(22.5)
Proceeds from issuance of long-term debt	199.1	99.5	627.0
Repayment of long-term debt and finance lease obligation	(25.5)	(18.5)	(21.5)
Net cash provided by financing activities	195.9	113.5	906.6
Net (Decrease) Increase in Cash and Cash Equivalents	(6.1)	3.0	(1.3)
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item	0.7	(0.2)	0.2
Cash and Cash Equivalents — Beginning of Period	7.9	4.9	6.2
Cash and Cash Equivalents — End of Period	1.8	7.9	4.9
Increase (Decrease) in Interest Payable, Net	3.9	(2.2)	3.7
Proceeds from Issuance or Sale of Equity	123.0	72.6	366.4
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation	195.9	113.5	906.6
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation	(435.7)	(349.9)	(1,111.4)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation	233.7	239.4	203.5
Cash and Cash Equivalents, Period Increase (Decrease)	(6.1)	3.0	(1.3)
Cash and cash equivalents	$ 1.8	$ 7.9	$ 4.9