Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities:
Net Income	$ 15.3	$ 11.3
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:
Depreciation and Amortization	31.2	28.8
Deferred Tax Provision	8.2	6.0
Changes in Working Capital Items:
Accounts Receivable	10.6	12.5
Accrued Revenue	25.2	23.2
Exchange Gas Receivable	(3.7)	(3.4)
Accounts Payable	(18.8)	(11.2)
Regulatory Liabilities	3.3	4.6
Other Changes in Working Capital Items	7.0	(1.7)
Deferred Regulatory and Other Charges	5.1	14.0
Other, net	(0.8)
Cash Provided by Operating Activities	82.6	84.1
Investing Activities:
Property, Plant and Equipment Additions	(60.7)	(64.6)
Cash (Used in) Investing Activities	(60.7)	(64.6)
Financing Activities:
Repayment of Short-Term Debt, net	(16.5)	(5.8)
Repayment of Long-Term Debt	(0.4)	(0.3)
Increase / (Decrease) in Capital Lease Obligations	5.6	(0.6)
Net Decrease in Exchange Gas Financing	3.6	3.1
Dividends Paid	(14.4)	(14.3)
Proceeds from Issuance of Common Stock, net	0.9	0.9
Cash (Used in) Financing Activities	(21.2)	(17.0)
Net Increase in Cash and Cash Equivalents	0.7	2.5
Cash and Cash Equivalents at Beginning of Period	9.4	9.8
Cash and Cash Equivalents at End of Period	10.1	12.3
Supplemental Cash Flow Information:
Interest Paid	13.5	13.2
Income Taxes Paid	1.2	0.8
Non-cash Investing Activity:
Capital Expenditures Included in Accounts Payable	$ 1.7	$ 1.1