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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating Activities:    
Net Income $ 22.0 $ 17.8
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 37.4 35.2
Deferred Tax Provision 4.6 11.2
Changes in Working Capital Items:    
Accounts Receivable 15.1 7.1
Accrued Revenue 17.3 10.3
Exchange Gas Receivable (4.3) (1.2)
Regulatory Liabilities 3.0 4.6
Accounts Payable (14.1) (8.3)
Other Changes in Working Capital Items 3.7 (2.6)
Deferred Regulatory and Other Charges (5.7) (5.1)
Other, net (9.0) 5.7
Cash Provided by Operating Activities 70.0 74.7
Investing Activities:    
Property, Plant and Equipment Additions (76.3) (84.2)
Cash (Used in) Investing Activities (76.3) (84.2)
Financing Activities:    
Proceeds from (Repayment of) Short-Term Debt, net 30.8 30.0
Repayment of Long-Term Debt (13.5) (0.4)
Decrease in Capital Lease Obligations (2.3) (1.8)
Net Increase in Exchange Gas Financing 4.1 1.1
Dividends Paid (16.3) (15.3)
Proceeds from Issuance of Common Stock, net 0.9 1.0
Cash Provided by Financing Activities 3.7 14.6
Net (Decrease) Increase in Cash and Cash Equivalents (2.6) 5.1
Cash and Cash Equivalents at Beginning of Period 8.9 5.8
Cash and Cash Equivalents at End of Period 6.3 10.9
Supplemental Cash Flow Information:    
Interest Paid 15.6 15.2
Income Taxes Paid 0.4  
Payments on Capital Leases 2.3 2.5
Non-cash Investing Activity:    
Capital Expenditures Included in Accounts Payable $ 1.2 $ 1.8