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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Activities:      
Net Income $ 41.4 $ 36.1 $ 32.2
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:      
Depreciation and Amortization 62.6 59.5 54.5
Deferred Tax Provision 11.0 10.8 9.3
Changes in Working Capital Items:      
Accounts Receivable (6.9) (4.9) (6.9)
Accrued Revenue (11.6) (10.3) (0.9)
Regulatory Liabilities 5.5 4.0 (1.9)
Exchange Gas Receivable (10.6) (2.5) 1.2
Accounts Payable 16.2 19.2 (4.4)
Other Changes in Working Capital Items 1.4 0.7 (2.4)
Deferred Regulatory and Other Charges (6.5) (2.7) (9.3)
Other, net (4.8) (2.1) 4.3
Cash Provided by Operating Activities 97.7 107.8 75.7
Investing Activities:      
Property, Plant and Equipment Additions (122.1) (115.0) (122.6)
Cash Used In Investing Activities (122.1) (115.0) (122.6)
Financing Activities:      
Proceeds from (Repayment of) Short-Term Debt, net 51.9 9.4 (3.9)
Issuance of Long-Term Debt 0.0 0.0 99.7
Repayment of Long-Term Debt (10.4) (25.8) (24.8)
Long-Term Debt Issuance Costs 0.0 0.0 (0.6)
Decrease in Capital Lease Obligations (0.1) (0.1) (0.1)
Net Increase (Decrease) in Exchange Gas Financing 9.6 2.3 (1.1)
Dividends Paid (25.1) (23.6) (22.6)
Proceeds from Issuance of Common Stock 1.0 45.5 1.1
Cash Provided by (Used In) Financing Activities 26.9 7.7 47.7
Net Increase (Decrease) in Cash and Cash Equivalents 2.5 0.5 0.8
Cash and Cash Equivalents at Beginning of Year 6.5 6.0 5.2
Cash and Cash Equivalents at End of Year 9.0 6.5 6.0
Supplemental Information:      
Interest Paid 26.0 26.0 23.7
Income Taxes Paid 1.2 1.4 0.9
Payments on Capital Leases 0.2 0.2 0.3
Capital Expenditures Included in Accounts Payable 7.3 4.9 1.7
Right-of-Use Assets Obtained in Exchange for Lease Obligations $ 1.1 $ 0.7 $ 1.2