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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current Assets [Abstract]    
Cash and Cash Equivalents $ 77.3 $ 80.8
Accounts Receivable (Less Allowance of $1.0 and $1.0) 86.2 89.0
Inventories 64.3 69.8
Prepayments and Other 28.1 33.6
Total Current Assets 255.9 273.2
Property, Plant and Equipment - Net 2,366.7 2,347.6
Regulatory Assets 336.6 340.3
Investment in ATC 109.0 107.3
Other Investments 138.6 143.5
Other Non-Current Assets 44.5 41.5
Total Assets 3,251.3 3,253.4
Current Liabilities [Abstract]    
Accounts Payable 53.3 90.5
Accrued Taxes 36.2 30.2
Accrued Interest 14.1 15.6
Long-Term Debt Due Within One Year 41.2 84.5
Other 57.8 62.6
Total Current Liabilities 202.6 283.4
Long-Term Debt 975.1 933.6
Deferred Income Taxes 430.9 423.8
Regulatory Liabilities 59.2 60.1
Defined Benefit Pension and Other Postretirement Benefit Plans 216.3 228.2
Other Non-Current Liabilities 126.7 123.3
Total Liabilities 2,010.8 2,052.4
Commitments, Guarantees and Contingencies (Note 14)      
Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 39.9 and 39.4 Shares Outstanding 808.7 784.7
Unearned ESOP Shares (19.2) (21.3)
Accumulated Other Comprehensive Loss (21.6) [1] (22.0) [1]
Retained Earnings 472.6 459.6
Total Equity 1,240.5 1,201.0
Total Liabilities and Equity $ 3,251.3 $ 3,253.4
[1] Amounts shown are net of tax.