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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Activities:      
Net Income $ 18.2 $ 16.4 $ 9.6
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:      
Depreciation and Amortization 35.1 29.3 28.9
Deferred Taxes Provision 10.8 8.7 10.5
Changes in Working Capital Items:      
Accounts Receivable (1.7) (7.3) (3.4)
Accrued Revenue (3.9) (4.8) (3.5)
Taxes Refundable / Payable (0.3) 8.5 (5.8)
Gas Inventory 4.3 (4.2) 3.7
Accounts Payable 4.5 (0.1) 1.4
Other Changes in Working Capital Items (0.5) 0.5 (4.6)
Deferred Regulatory and Other Charges 3.6 1.1 (4.3)
Other, net (3.4) (2.2) (6.6)
Cash Provided by Operating Activities 66.7 45.9 25.9
Investing Activities:      
Property, Plant and Equipment Additions (68.5) (57.1) (49.6)
Cash (Used In) Investing Activities (68.5) (57.1) (49.6)
Financing Activities:      
Proceeds from (Repayment of) Short-Term Debt, net (38.5) 21.1 2.3
Proceeds from Issuance of Long-Term Debt     40.0
Repayment of Long-Term Debt (0.5) (0.5) (0.5)
Net Increase (Decrease) in Gas Inventory Financing (3.8) 4.6 (2.2)
Dividends Paid (17.2) (15.2) (15.0)
Retirement of Preferred Stock (1.8)    
Proceeds from Issuance of Common Stock 66.8 1.0 0.9
Other, net (0.9) (1.2) (0.6)
Cash Provided by Financing Activities 4.1 9.8 24.9
Net Increase (Decrease) in Cash 2.3 (1.4) 1.2
Cash at Beginning of Year 7.5 8.9 7.7
Cash at End of Year 9.8 7.5 8.9
Supplemental Information:      
Interest Paid 21.2 21.2 20.5
Income Taxes (Refunded) Paid 0.7 (7.3) 2.3
Non-cash Investing Activity:      
Capital Expenditures Included in Accounts Payable $ 1.9 $ 2.6 $ 1.5