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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating Activities:    
Net Income $ 17.8 $ 16.9
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 35.2 35.1
Deferred Tax Provision 11.2 12.8
Changes in Working Capital Items:    
Accounts Receivable 7.1 6.7
Accrued Revenue 10.3 2.9
Exchange Gas Receivable (1.2) 1.3
Regulatory Liabilities 4.6 (2.4)
Accounts Payable (8.3) (10.2)
Taxes Payable (0.1) (3.7)
Other Changes in Working Capital Items (2.5) 2.2
Deferred Regulatory and Other Charges (5.1) (2.6)
Other, net 5.7 3.7
Cash Provided by Operating Activities 74.7 62.7
Investing Activities:    
Property, Plant and Equipment Additions (84.2) (74.4)
Cash (Used in) Investing Activities (84.2) (74.4)
Financing Activities:    
Proceeds from (Repayment of) Short-Term Debt, net 30.0 (5.1)
Repayment of Long-Term Debt (0.4) (0.5)
Issuance of Long-Term Debt   30.0
Decrease in Capital Lease Obligations (1.8) (2.0)
Net Increase (Decrease) in Exchange Gas Financing 1.1 (1.0)
Dividends Paid (15.3) (15.0)
Proceeds from Issuance of Common Stock, net 1.0 1.0
Cash Provided by Financing Activities 14.6 7.4
Net Increase (Decrease)in Cash and Cash Equivalents 5.1 (4.3)
Cash and Cash Equivalents at Beginning of Period 5.8 8.7
Cash and Cash Equivalents at End of Period 10.9 4.4
Supplemental Cash Flow Information:    
Interest Paid 15.2 14.2
Income Taxes Paid   1.6
Payments on Capital Leases 2.5 2.6
Non-cash Investing Activity:    
Capital Expenditures Included in Accounts Payable $ 1.8 $ 1.4