Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net Income	$ 118.6	$ 87.2	$ 89.8
Adjustments to reconcile net income to net operating cash:
Depreciation and amortization	65.7	65.5	69.0
Depreciation and accretion included in operations expenses	15.8	11.9	11.0
Deferred income taxes, net	36.4	3.4	23.7
Realized (loss) on sale of assets/commodity contracts	(4.4)	(0.8)	(7.5)
Unrealized loss (gain) on investments/commodity contracts	(1.8)	(1.9)	1.8
Employee benefits and compensation	0.0	0.3	(1.1)
Share-based compensation	8.4	7.6	6.4
Changes in assets and liabilities:
Accounts receivable and accrued revenue	(10.3)	2.3	(11.2)
Propane inventory, storage gas and other inventory	3.3	0.3	(7.8)
Regulatory assets/liabilities, net	0.2	20.1	(38.6)
Prepaid expenses and other current assets	0.4	18.7	9.1
Accounts payable and other accrued liabilities	0.4	(16.8)	2.7
Income taxes receivable	(2.9)	(1.3)	14.9
Customer deposits and refunds	(0.7)	3.9	0.7
Accrued compensation	7.0	1.5	(1.2)
Other assets and liabilities, net	5.7	(2.3)	(2.8)
Net cash provided by operating activities	239.4	203.5	158.9
Investing Activities
Property, plant and equipment expenditures	(355.3)	(188.6)	(128.3)
Proceeds from sale of assets	5.2	2.9	3.9
Acquisitions, net of cash acquired	0.6	(925.0)	(11.8)
Environmental expenditures	(0.4)	(0.7)	(0.3)
Net cash used in investing activities	(349.9)	(1,111.4)	(136.5)
Financing Activities
Common stock dividends	(54.2)	(40.0)	(35.2)
Payment, Tax Withholding, Share-based Payment Arrangement	(1.5)	(2.5)	(2.8)
Change in cash overdrafts due to outstanding checks	1.5	(0.3)	1.0
Net borrowings (repayments) under line of credit agreements	14.1	(22.5)	(20.6)
Proceeds from issuance of long-term debt	99.5	627.0	49.9
Repayment of long-term debt and finance lease obligation	(18.5)	(21.5)	(18.0)
Net cash provided by (used in) financing activities	113.5	906.6	(21.2)
Net (Decrease) Increase in Cash and Cash Equivalents	3.0	(1.3)	1.2
Other Operating Activities, Cash Flow Statement	(0.2)	0.2	0.0
Cash and Cash Equivalents — Beginning of Period	4.9	6.2	5.0
Cash and Cash Equivalents — End of Period	7.9	4.9	6.2
Increase (Decrease) in Interest Payable, Net	(2.2)	3.7	0.0
Proceeds from Issuance or Sale of Equity	72.6	366.4	4.5
Net Cash Provided by (Used in) Financing Activities	113.5	906.6	(21.2)
Net Cash Provided by (Used in) Investing Activities	(349.9)	(1,111.4)	(136.5)
Net Cash Provided by (Used in) Operating Activities	239.4	203.5	158.9
Cash and Cash Equivalents, Period Increase (Decrease)	3.0	(1.3)	1.2
Cash and cash equivalents	$ 7.9	$ 4.9	$ 6.2