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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Activities:      
Net Income $ 27.1 $ 26.3 $ 24.7
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:      
Depreciation and Amortization 46.6 45.7 42.1
Deferred Tax Provision 15.4 11.9 14.4
Changes in Working Capital Items:      
Accounts Receivable (5.4) 10.9 (8.5)
Accrued Revenue (11.1) 10.1 8.1
Regulatory Liabilities (5.2) 6.9 (1.0)
Exchange Gas Receivable 2.8 3.9 (4.2)
Accounts Payable (0.9) (10.9) 6.1
Other Changes in Working Capital Items (1.0) (2.4) 6.5
Deferred Regulatory and Other Charges (5.0) 8.2 (1.4)
Other, net 5.0 4.5 (2.8)
Cash Provided by Operating Activities 68.3 115.1 84.0
Investing Activities:      
Property, Plant and Equipment Additions (98.1) (103.9) (92.6)
Cash Used In Investing Activities (98.1) (103.9) (92.6)
Financing Activities:      
Proceeds from (Repayment of) Short-Term Debt, net 39.9 12.7 (30.9)
Issuance of Long-Term Debt 30.0   50.0
Repayment of Long-Term Debt (19.0) (7.4) (4.4)
(Decrease) Increase in Capital Lease Obligations (2.8) 6.1 6.5
Net (Decrease) Increase in Exchange Gas Financing (2.5) (4.0) 4.4
Dividends Paid (20.0) (19.6) (19.2)
Proceeds from Issuance of Common Stock 1.3 1.3 1.2
Cash Provided by (Used In) Financing Activities 26.9 (10.9) 7.6
Net (Decrease) Increase in Cash (2.9) 0.3 (1.0)
Cash at Beginning of Year 8.7 8.4 9.4
Cash at End of Year 5.8 8.7 8.4
Supplemental Information:      
Interest Paid 22.1 22.3 20.8
Income Taxes Paid 1.6 1.8 1.2
Payments on Capital Leases 3.4 1.1 0.6
Capital Expenditures Included in Accounts Payable 0.3 $ 0.4 $ 0.3
Non-Cash Additions to Property, Plant and Equipment $ 3.5