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Consolidated Statement of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Activities      
Net Income $ 93.6 $ 74.8 $ 60.7
Allowance for Funds Used During Construction (2.5) (4.2) (5.8)
Loss (Income) from Equity Investments, Net of Dividends (3.2) (3.1) 0.1
Gain on Real Estate Foreclosure (0.5) (0.7) 0
Gain on Sale of Assets (0.9) 0 (0.2)
Loss on Impairment of Assets 1.7 0 3.1
Depreciation Expense 90.4 80.5 64.7
Amortization of Debt Issuance Costs 0.9 0.9 0.9
Deferred Income Tax Expense 35.8 66.0 75.2
Share-Based Compensation Expense 1.6 2.2 2.1
ESOP Compensation Expense 7.4 7.1 6.5
Defined Benefit Pension and Postretirement Benefit Expense 23.6 18.0 11.7
Bad Debt Expense 1.2 1.1 1.3
Changes in Operating Assets and Liabilities      
Accounts Receivable 18.6 17.9 (43.5)
Inventories (9.1) (3.0) (7.3)
Prepayments and Other 1.5 (4.3) 0
Accounts Payable (9.5) 5.8 10.5
Other Current Liabilities 15.4 5.2 5.3
Cash Contributions to Defined Benefit Pension and Postretirement Plans (24.7) (39.3) (30.2)
Changes in Regulatory and Other Non-Current Assets (7.5) 4.2 (25.6)
Changes in Regulatory and Other Non-Current Liabilities 7.9 (0.4) 7.9
Cash from Operating Activities 241.7 228.7 137.4
Investing Activities      
Proceeds from Sale of Available-for-sale Securities 7.8 0.6 8.9
Payments for Purchase of Available-for-sale Securities (2.3) (2.3) (2.2)
Investment in ATC (2.0) (1.6) (7.8)
Changes to Other Investments (7.4) 1.3 (0.7)
Additions to Property, Plant and Equipment (239.2) (248.9) (318.5)
Proceeds from Sale of Assets 2.2 0 0.3
Cash for Investing Activities (240.9) (250.9) (320.0)
Financing Activities      
Proceeds from Issuance of Common Stock 39.1 20.5 65.2
Proceeds from Issuance of Long-Term Debt 81.4 155.0 111.4
Changes in Notes Payable 0.1 (0.9) (4.1)
Reductions of Long-Term Debt (3.1) (71.0) (9.1)
Debt Issuance Costs 0 (1.4) (0.6)
Dividends on Common Stock (62.1) (60.8) (56.5)
Cash from Financing Activities 55.4 41.4 106.3
Change in Cash and Cash Equivalents 56.2 19.2 (76.3)
Cash and Cash Equivalents at Beginning of Period 44.9 25.7 102.0
Cash and Cash Equivalents at End of Period $ 101.1 $ 44.9 $ 25.7