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Consolidated Statement 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 $ 97.1 $ 93.6 $ 74.8
Allowance for Funds Used During Construction - Equity (5.1) (2.5) (4.2)
Income from Equity Investments, Net of Dividends (3.7) (3.2) (3.1)
Gain on Real Estate Foreclosure 0 (0.5) (0.7)
Loss (Gain) on Sale of Assets 0.2 (0.9) 0
Loss on Impairment of Assets 0 1.7 0
Depreciation Expense 100.2 90.4 80.5
Amortization of Debt Issuance Costs 1.0 0.9 0.9
Deferred Income Tax Expense 37.5 35.8 66.0
Share-Based Compensation Expense 2.1 1.6 2.2
ESOP Compensation Expense 7.7 7.4 7.1
Defined Benefit Pension and Other Postretirement Benefit Expense 27.5 23.6 18.0
Bad Debt Expense 1.0 1.2 1.1
Changes in Operating Assets and Liabilities      
Accounts Receivable (10.1) 18.6 17.9
Inventories (0.7) (9.1) (3.0)
Prepayments and Other (6.5) 1.5 (4.3)
Accounts Payable (1.5) (9.5) 5.8
Other Current Liabilities 21.8 15.4 5.2
Cash Contributions to Defined Benefit Pension and Other Postretirement Plans (8.8) (24.7) (39.3)
Changes in Regulatory and Other Non-Current Assets (20.9) (7.5) 4.2
Changes in Regulatory and Other Non-Current Liabilities 0.8 7.9 (0.4)
Cash from Operating Activities 239.6 241.7 228.7
Investing Activities      
Proceeds from Sale of Available-for-sale Securities 1.5 7.8 0.6
Payments for Purchase of Available-for-sale Securities (1.8) (2.3) (2.3)
Investment in ATC (4.7) (2.0) (1.6)
Changes to Other Investments (9.6) (7.4) 1.3
Additions to Property, Plant and Equipment (405.8) (239.2) (248.9)
Proceeds from Sale of Assets 0.3 2.2 0
Cash for Investing Activities (420.1) (240.9) (250.9)
Financing Activities      
Proceeds from Issuance of Common Stock 77.0 39.1 20.5
Proceeds from Issuance of Long-Term Debt 180.6 81.4 155.0
Changes in Notes Payable (1.1) 0.1 (0.9)
Reductions of Long-Term Debt (25.9) (3.1) (71.0)
Debt Issuance Costs (1.3) 0 (1.4)
Dividends on Common Stock (69.1) (62.1) (60.8)
Cash from Financing Activities 160.2 55.4 41.4
Change in Cash and Cash Equivalents (20.3) 56.2 19.2
Cash and Cash Equivalents at Beginning of Period 101.1 44.9 25.7
Cash and Cash Equivalents at End of Period $ 80.8 $ 101.1 $ 44.9