Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating Activities
Net Income	$ 94.2	$ 81.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	67.7	51.7
Depreciation and accretion included in other costs	11.7	11.6
Deferred income taxes	43.3	30.6
Realized loss on commodity contracts and sale of assets	(2.2)	(3.8)
Unrealized gain on investments and commodity contracts	(1.8)	(1.7)
Employee benefits and compensation	0.0	(0.1)
Share-based compensation	6.0	6.4
Changes in assets and liabilities:
Accounts receivable and accrued revenue	11.2	26.3
Propane inventory, storage gas and other inventory	0.3	1.7
Regulatory assets and liabilities, net	(17.0)	5.1
Prepaid expenses and other current assets	(2.7)	(0.4)
Accounts payable and other accrued liabilities	10.4	6.5
Income taxes receivable	(21.9)	(8.7)
Customer deposits and refunds	(0.8)	1.0
Accrued compensation	(12.3)	(2.3)
Other assets and liabilities, net	(0.4)	5.3
Net cash provided by operating activities	198.3	217.7
Investing Activities
Property, plant and equipment expenditures	(322.2)	(259.6)
Proceeds from sale of assets	4.0	3.1
Environmental expenditures		0.1
Net cash used in investing activities	(318.2)	(256.0)
Financing Activities
Common stock dividends	(44.8)	(39.9)
Proceeds from issuance of common stock, net of expenses	76.1	56.7
Tax withholding payments related to net settled stock compensation	(1.0)	(1.5)
Change in cash overdrafts due to outstanding checks	2.4	1.4
Net borrowings (repayments) under line of credit agreements	(103.5)	32.9
Proceeds from issuance of long-term debt	199.1	(0.1)
Repayment of long-term debt and finance lease obligation	(14.5)	(14.5)
Net cash provided by financing activities	113.8	35.0
Net Decrease in Cash and Cash Equivalents	(6.1)	(3.3)
Cash and Cash Equivalents—Beginning of Period	7.9	4.9
Payments to Acquire Businesses, Gross	0.0	0.6
Accrued compensation	(12.3)	(2.3)
Net Income	94.2	81.9
Depreciation and amortization	67.7	51.7
Depreciation and accretion included in other costs	11.7	11.6
Deferred Income Tax Expense (Benefit)	43.3	30.6
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	2.2	3.8
Unrealized Gain (Loss) on Commodity Contracts	1.8	1.7
Employee benefits and compensation	0.0	(0.1)
Share-based compensation	6.0	6.4
Other Noncash Expense		(0.2)
Increase (Decrease) in Accounts Receivable	(11.2)	(26.3)
Increase (Decrease) in Inventories	(0.3)	(1.7)
Increase (Decrease) in Regulatory Assets and Liabilities	17.0	(5.1)
Increase (Decrease) in Prepaid Expense and Other Assets	2.7	0.4
Accounts payable and other accrued liabilities	10.4	6.5
Increase (Decrease) in Income Taxes Receivable	21.9	8.7
Customer deposits and refunds	(0.8)	1.0
Increase (Decrease) in Interest Payable, Net	12.6	6.8
Increase (Decrease) in Other Operating Assets and Liabilities, Net	0.4	(5.3)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation	198.3	217.7
Payments to Acquire Property, Plant, and Equipment	322.2	259.6
Proceeds from sale of assets	4.0	3.1
Environmental expenditures		0.1
Net cash used in investing activities	(318.2)	(256.0)
Payments of Ordinary Dividends, Common Stock	44.8	39.9
Proceeds from issuance of common stock, net of expenses	76.1	56.7
Payment, Tax Withholding, Share-based Payment Arrangement	1.0	1.5
Change in cash overdrafts due to outstanding checks	2.4	1.4
Net borrowings (repayments) under line of credit agreements	(103.5)	32.9
Proceeds from issuance of long-term debt	(199.1)	0.1
Repayments of Long-term Debt	14.5	14.5
Net cash provided by financing activities	113.8	35.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(6.1)	(3.3)
Cash and cash equivalents	$ 1.8	$ 1.6