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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating Activities:    
Net Income $ 11.3 $ 9.2
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 28.2 25.9
Deferred Tax Provision 6.0 4.9
Changes in Working Capital Items:    
Accounts Receivable 12.5 12.3
Accrued Revenue 23.2 18.2
Regulatory Liabilities 4.6 (3.9)
Exchange Gas Receivable (3.4) 2.2
Accounts Payable (11.2) (8.1)
Other Changes in Working Capital Items (1.7) (4.8)
Deferred Regulatory and Other Charges 13.9 9.3
Other, net 0.7 (3.3)
Cash Provided by Operating Activities 84.1 61.9
Investing Activities:    
Property, Plant and Equipment Additions (64.6) (47.4)
Cash (Used in) Investing Activities (64.6) (47.4)
Financing Activities:    
Repayment of Short-Term Debt (5.8) (63.8)
Repayment of Long-Term Debt (0.3) (0.3)
Net Increase (Decrease) in Exchange Gas Financing 3.1 (1.8)
Dividends Paid (14.3) (12.4)
Proceeds from Issuance of Common Stock, net 0.9 66.5
Other, net (0.6) (0.7)
Cash (Used in) Financing Activities (17.0) (12.5)
Net Increase in Cash 2.5 2.0
Cash at Beginning of Period 9.8 7.5
Cash at End of Period 12.3 9.5
Supplemental Cash Flow Information:    
Interest Paid 13.2 13.5
Income Taxes Paid 0.8 0.7
Non-cash Investing Activity:    
Capital Expenditures Included in Accounts Payable $ 1.1 $ 1.5