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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating Activities:    
Net Income $ 19.2 $ 15.5
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 25.0 24.4
Deferred Tax Provision 3.6 8.7
Changes in Working Capital Items:    
Accounts Receivable 11.2 11.8
Accrued Revenue 23.6 12.9
Exchange Gas Receivable 0.3 2.4
Regulatory Liabilities 5.0 6.2
Accounts Payable (16.8) (9.4)
Other Changes in Working Capital Items (4.9) (5.4)
Deferred Regulatory and Other Charges (10.3) (9.5)
Other, net 7.4 5.6
Cash Provided by Operating Activities 63.3 63.2
Investing Activities:    
Property, Plant and Equipment Additions (37.2) (44.9)
Cash (Used in) Investing Activities (37.2) (44.9)
Financing Activities:    
(Repayment of) Proceeds from Short-Term Debt, net (0.9) (2.7)
Repayment of Long-Term Debt (13.5) (0.4)
Decrease in Capital Lease Obligations (1.6) (1.4)
Net Decrease in Exchange Gas Financing (0.2) (2.3)
Dividends Paid (10.9) (10.2)
Proceeds from Issuance of Common Stock, net 0.6 0.7
Cash (Used in) Financing Activities (26.5) (16.3)
Net Increase (Decrease)in Cash and Cash Equivalents (0.4) 2.0
Cash and Cash Equivalents at Beginning of Period 8.9 5.8
Cash and Cash Equivalents at End of Period 8.5 7.8
Supplemental Cash Flow Information:    
Interest Paid 12.4 11.4
Income Taxes Paid 0.4  
Payments on Capital Leases 1.5 1.7
Non-cash Investing Activity:    
Capital Expenditures Included in Accounts Payable $ 0.4 $ 0.9