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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating Activities:    
Net Income $ 21.6 $ 18.6
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 44.5 40.7
Deferred Tax Provision 5.5 3.0
Changes in Working Capital Items:    
Accounts Receivable 15.7 6.5
Accrued Revenue 12.3 10.9
Exchange Gas Receivable (5.6) (0.4)
Regulatory Liabilities 7.6 3.2
Accounts Payable (3.7) (12.5)
Other Changes in Working Capital Items 2.7 0.9
Deferred Regulatory and Other Charges (8.0) 5.3
Other, net 3.3 (1.3)
Cash Provided by Operating Activities 95.9 74.9
Investing Activities:    
Property, Plant and Equipment Additions (81.5) (93.6)
Cash (Used in) Investing Activities (81.5) (93.6)
Financing Activities:    
Repayment of Short-Term Debt, net (24.2) (41.3)
Repayment of Long-Term Debt (20.3) (15.9)
Issuance of Long-Term Debt   95.0
Long-Term Debt Issuance Costs   (0.5)
Net Increase in Exchange Gas Financing 5.2 0.5
Decrease in Capital Lease Obligations (0.1)  
Dividends Paid (17.5) (16.9)
Proceeds from Issuance of Common Stock 45.3 0.8
Cash (Used in) Provided by Financing Activities (11.6) 21.7
Net Increase in Cash and Cash Equivalents 2.8 3.0
Cash and Cash Equivalents at Beginning of Period 6.0 5.2
Cash and Cash Equivalents at End of Period 8.8 8.2
Supplemental Cash Flow Information:    
Interest Paid 17.9 15.3
Income Taxes Paid 1.4 0.8
Payments on Capital Leases 0.2 0.2
Non-cash Investing Activity:    
Capital Expenditures Included in Accounts Payable 4.2 0.6
Right-of-Use Assets Obtained in Exchange for Lease Obligations $ 0.9 $ 1.6