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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating Activities:    
Net Income $ 10.7 $ 8.7
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 18.6 17.0
Deferred Tax Provision 5.8 5.3
Changes in Working Capital Items:    
Accounts Receivable 6.9 11.9
Accrued Revenue 25.1 21.2
Regulatory Liabilities 6.5 (3.2)
Exchange Gas Receivable 1.8 5.0
Accounts Payable (11.0) (9.9)
Other Changes in Working Capital Items (6.5) (6.1)
Deferred Regulatory and Other Charges 7.6 4.1
Other, net 4.8 (1.1)
Cash Provided by Operating Activities 70.3 52.9
Investing Activities:    
Property, Plant and Equipment Additions (37.0) (23.9)
Cash (Used in) Investing Activities (37.0) (23.9)
Financing Activities:    
Repayment of Short-Term Debt (24.9) (82.9)
Repayment of Long-Term Debt (0.2) (0.2)
Net Decrease in Exchange Gas Financing (1.6) (4.5)
Dividends Paid (9.5) (7.6)
Proceeds from Issuance of Common Stock, net 0.6 66.0
Other, net (0.4) (0.5)
Cash (Used in) Financing Activities (36.0) (29.7)
Net Decrease in Cash (2.7) (0.7)
Cash at Beginning of Period 9.8 7.5
Cash at End of Period 7.1 6.8
Supplemental Cash Flow Information:    
Interest Paid 10.4 10.8
Income Taxes Paid 0.8 0.6
Non-cash Investing Activity:    
Capital Expenditures Included in Accounts Payable $ 1.8 $ 1.3