Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Activities
Net Income	$ 50.9	$ 46.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22.5	17.0
Depreciation and accretion included in other costs	4.0	4.0
Deferred income taxes	16.5	11.9
Realized loss on commodity contracts and sale of assets	(1.1)	(1.8)
Unrealized gain on investments and commodity contracts	0.4	(0.8)
Share-based compensation	2.3	2.1
Changes in assets and liabilities:
Accounts receivable and accrued revenue	(13.9)	7.8
Propane inventory, storage gas and other inventory	1.6	4.8
Regulatory assets and liabilities, net	3.6	10.1
Prepaid expenses and other current assets	1.6	2.6
Accounts payable and other accrued liabilities	2.9	(10.1)
Income taxes receivable	1.9	4.6
Customer deposits and refunds	(3.7)	(2.7)
Accrued compensation	(14.6)	(9.5)
Other assets and liabilities, net	(1.3)	1.0
Net cash provided by operating activities	85.0	97.3
Investing Activities
Property, plant and equipment expenditures	(113.8)	(75.5)
Proceeds from sale of assets	0.6	0.3
Environmental expenditures	(0.1)	0.1
Net cash used in investing activities	(113.1)	(74.7)
Financing Activities
Common stock dividends	(14.5)	(12.9)
Proceeds from issuance of common stock, net of expenses	19.8	0.0
Tax withholding payments related to net settled stock compensation	(1.0)	(1.5)
Change in cash overdrafts due to outstanding checks	(1.7)	0.7
Net borrowings (repayments) under line of credit agreements	20.3	(10.2)
Repayment of long-term debt and finance lease obligation	(2.0)	(1.9)
Net cash provided by (used in) financing activities	20.9	(25.8)
Net Decrease in Cash and Cash Equivalents	(7.2)	(3.2)
Cash and Cash Equivalents—Beginning of Period	7.9	4.9
Payments to Acquire Businesses, Gross	0.0	0.6
Accrued compensation	(14.6)	(9.5)
Net Income	50.9	46.2
Depreciation and amortization	22.5	17.0
Depreciation and accretion included in other costs	4.0	4.0
Deferred Income Tax Expense (Benefit)	16.5	11.9
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	1.1	1.8
Unrealized Gain (Loss) on Commodity Contracts	(0.4)	0.8
Share-based compensation	2.3	2.1
Increase (Decrease) in Accounts Receivable	13.9	(7.8)
Increase (Decrease) in Inventories	(1.6)	(4.8)
Increase (Decrease) in Regulatory Assets and Liabilities	(3.6)	(10.1)
Increase (Decrease) in Prepaid Expense and Other Assets	(1.6)	(2.6)
Accounts payable and other accrued liabilities	2.9	(10.1)
Increase (Decrease) in Income Taxes Receivable	(1.9)	(4.6)
Customer deposits and refunds	(3.7)	(2.7)
Increase (Decrease) in Interest Payable, Net	11.4	10.1
Increase (Decrease) in Other Operating Assets and Liabilities, Net	1.3	(1.0)
Net Cash Provided by (Used in) Operating Activities	85.0	97.3
Payments to Acquire Property, Plant, and Equipment	113.8	75.5
Proceeds from sale of assets	0.6	0.3
Environmental expenditures	(0.1)	0.1
Net cash used in investing activities	(113.1)	(74.7)
Payments of Ordinary Dividends, Common Stock	14.5	12.9
Proceeds from issuance of common stock, net of expenses	19.8	0.0
Payment, Tax Withholding, Share-based Payment Arrangement	1.0	1.5
Change in cash overdrafts due to outstanding checks	(1.7)	0.7
Net borrowings (repayments) under line of credit agreements	20.3	(10.2)
Repayments of Long-term Debt	2.0	1.9
Net cash provided by (used in) financing activities	20.9	(25.8)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(7.2)	$ (3.2)
Cash and cash equivalents	$ 0.7