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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:      
Net Income $ 33.0 $ 29.0 $ 27.1
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:      
Depreciation and Amortization 50.4 46.9 46.6
Deferred Tax Provision 8.0 17.5 15.4
Changes in Working Capital Items:      
Accounts Receivable 0.6 (14.5) (5.4)
Accrued Revenue (1.4) (3.8) (11.1)
Regulatory Liabilities 2.3 (1.2) (5.2)
Exchange Gas Receivable (2.3) 2.5 2.8
Accounts Payable 1.1 9.1 (0.9)
Other Changes in Working Capital Items 3.6 (1.8) (1.0)
Deferred Regulatory and Other Charges (11.3) (6.1) (5.0)
Other, net (5.5) 8.6 5.0
Cash Provided by Operating Activities 78.5 86.2 68.3
Investing Activities:      
Property, Plant and Equipment Additions (102.4) (119.3) (98.1)
Cash Used In Investing Activities (102.4) (119.3) (98.1)
Financing Activities:      
Proceeds from (Repayment of) Short-Term Debt, net 44.5 (43.6) 39.9
Issuance of Long-Term Debt 29.9 89.3 30.0
Repayment of Long-Term Debt (30.1) (17.2) (19.0)
Decrease in Capital Lease Obligations (3.0) (2.5) (2.8)
Net Increase (Decrease) in Exchange Gas Financing 2.1 (2.4) (2.5)
Dividends Paid (21.8) (20.4) (20.0)
Proceeds from Issuance of Common Stock 1.2 33.0 1.3
Cash Provided by Financing Activities 22.8 36.2 26.9
Net (Decrease) Increase in Cash (1.1) 3.1 (2.9)
Cash at Beginning of Year 8.9 5.8 8.7
Cash at End of Year 7.8 8.9 5.8
Supplemental Information:      
Interest Paid 24.6 23.0 22.1
Income Taxes Paid 0.4   1.6
Payments on Capital Leases 3.3 3.3 3.4
Capital Expenditures Included in Accounts Payable $ 0.5 $ 1.1 0.3
Non-Cash Additions to Property, Plant and Equipment     $ 3.5