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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities:      
Net Income $ 26.3 $ 24.7 $ 21.6
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:      
Depreciation and Amortization 45.7 42.1 38.5
Deferred Taxes Provision 11.9 14.4 12.3
Changes in Working Capital Items:      
Accounts Receivable 10.9 (8.5) (4.5)
Accrued Revenue 10.1 8.1 6.8
Regulatory Liabilities 6.9 (1.0) 2.9
Taxes Refundable / Payable 2.3 (0.1) (0.5)
Exchange Gas Receivable 3.9 (4.2) (1.4)
Accounts Payable (10.9) 6.1 5.4
Other Changes in Working Capital Items (5.4) 6.6 (2.9)
Deferred Regulatory and Other Charges 9.2 (1.6) 15.0
Other, net 4.2 (2.6) 3.1
Cash Provided by Operating Activities 115.1 84.0 96.3
Investing Activities:      
Property, Plant and Equipment Additions (103.9) (92.6) (89.5)
Cash Used In Investing Activities (103.9) (92.6) (89.5)
Financing Activities:      
Proceeds from (Repayment of) Short-Term Debt, net 12.7 (30.9) 10.8
Issuance of Long-Term Debt   50.0  
Repayment of Long-Term Debt (7.4) (4.4) (0.5)
Increase / (Decrease) in Capital Lease Obligations 6.1 6.5 (0.7)
Net (Decrease) Increase in Exchange Gas Financing (4.0) 4.4 1.2
Dividends Paid (19.6) (19.2) (19.1)
Proceeds from Issuance of Common Stock 1.3 1.2 1.1
Cash (Used In) Provided by Financing Activities (10.9) 7.6 (7.2)
Net Increase (Decrease) in Cash 0.3 (1.0) (0.4)
Cash at Beginning of Year 8.4 9.4 9.8
Cash at End of Year 8.7 8.4 9.4
Supplemental Information:      
Interest Paid 22.3 20.8 20.8
Income Taxes Paid 1.8 1.2 0.8
Payments on Capital Leases 1.1 0.6 0.7
Capital Expenditures Included in Accounts Payable $ 0.4 $ 0.3 $ 0.7