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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current Assets [Abstract]    
Cash and Cash Equivalents $ 145.0 $ 80.8
Accounts Receivable (Less Allowance of $1.1 and $1.0) 78.7 89.0
Inventories 71.0 69.8
Prepayments and Other 26.2 33.6
Total Current Assets 320.9 273.2
Property, Plant and Equipment - Net 2,397.2 2,347.6
Regulatory Assets 337.5 340.3
Investment in ATC 111.2 107.3
Other Investments 140.2 143.5
Other Non-Current Assets 43.9 41.5
Total Assets 3,350.9 3,253.4
Current Liabilities [Abstract]    
Accounts Payable 52.1 90.5
Accrued Taxes 26.4 30.2
Accrued Interest 15.9 15.6
Long-Term Debt Due Within One Year 37.9 84.5
Other 60.8 62.6
Total Current Liabilities 193.1 283.4
Long-Term Debt 1,064.7 933.6
Deferred Income Taxes 435.5 423.8
Regulatory Liabilities 63.1 60.1
Defined Benefit Pension and Other Postretirement Benefit Plans 216.2 228.2
Other Non-Current Liabilities 129.3 123.3
Total Liabilities 2,101.9 2,052.4
Commitments, Guarantees and Contingencies (Note 14)      
Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 40.1 and 39.4 Shares Outstanding 819.3 784.7
Unearned ESOP Shares (17.2) (21.3)
Accumulated Other Comprehensive Loss (21.0) [1] (22.0) [1]
Retained Earnings 467.9 459.6
Total Equity 1,249.0 1,201.0
Total Liabilities and Equity $ 3,350.9 $ 3,253.4
[1] Amounts shown are net of tax.