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Consolidated Balance Sheet - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current Assets [Abstract]    
Cash and Cash Equivalents $ 98.9 $ 27.5
Accounts Receivable (Less Allowance of $2.1 and $3.1) 135.1 122.5
Inventories – Net 95.9 104.2
Prepayments and Other 37.6 40.3
Total Current Assets 367.5 294.5
Property, Plant and Equipment – Net 3,822.4 3,741.2
Regulatory Assets 384.7 330.1
Investment in ATC 118.7 135.6
Other Investments 53.1 55.6
Goodwill and Intangible Assets – Net 225.9 213.4
Other Non-Current Assets 107.7 106.5
Total Assets [1] 5,080.0 4,876.9
Current Liabilities [Abstract]    
Accounts Payable 136.3 74.0
Accrued Taxes 50.0 46.5
Accrued Interest 17.6 17.6
Long-Term Debt Due Within One Year 64.1 187.7
Other 83.2 73.7
Total Current Liabilities 351.2 399.5
Long-Term Debt 1,439.2 1,370.4
Deferred Income Taxes 230.5 554.6
Regulatory Liabilities 532.0 125.8
Defined Benefit Pension and Other Postretirement Benefit Plans 191.8 210.9
Other Non-Current Liabilities 267.1 322.7
Total Liabilities 3,011.8 2,983.9
Commitments, Guarantees and Contingencies (Note 11)
Shareholders' Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 51.1 and 49.6 Shares Issued and Outstanding 1,401.4 1,295.3
Accumulated Other Comprehensive Loss (22.6) (28.2)
Retained Earnings 689.4 625.9
Total Shareholders' Equity 2,068.2 1,893.0
Total Liabilities and Shareholders' Equity $ 5,080.0 $ 4,876.9
[1] See Note 1. Operations and Significant Accounting Policies – Revision of Prior Balance Sheet.