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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operating Activities:    
Net Income $ 8.7 $ 8.0
Adjustments to Reconcile Net Income to Cash Provided by Operating Activities:    
Depreciation and Amortization 17.0 15.6
Deferred Tax Provision 5.3 4.5
Changes in Working Capital Items:    
Accounts Receivable 12.5 4.0
Accrued Revenue 25.9 20.7
Gas Inventory 5.7 2.3
Accounts Payable (10.5) (10.7)
Taxes Payable (0.9) 7.9
Other Changes in Working Capital Items (3.2) (1.8)
Deferred Regulatory and Other Charges (1.7) (0.6)
Other, net (5.9) (3.3)
Cash Provided by Operating Activities 52.9 46.6
Investing Activities:    
Property, Plant and Equipment Additions (23.9) (25.1)
Cash (Used in) Investing Activities (23.9) (25.1)
Financing Activities:    
Repayment of Short-Term Debt (82.9) (15.5)
Repayment of Long-Term Debt, net (0.2) (0.2)
Net Decrease in Gas Inventory Financing (4.5) (1.2)
Dividends Paid (7.6) (7.6)
Proceeds from Issuance of Common Stock, net 66.0 0.5
Other, net (0.5) (0.6)
Cash (Used in) Financing Activities (29.7) (24.6)
Net Decrease in Cash (0.7) (3.1)
Cash at Beginning of Period 7.5 8.9
Cash at End of Period 6.8 5.8
Supplemental Cash Flow Information:    
Interest Paid 10.8 10.8
Income Taxes Paid (Refunded) $ 0.6 $ (7.3)