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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment    
Utility Plant $ 22,346.0 $ 21,642.3
Accumulated depreciation and amortization (9,169.7) (8,986.4)
Net utility plant 13,176.3 12,655.9
Other property, at cost, less accumulated depreciation 297.6 260.0
Net Property, Plant and Equipment 13,473.9 12,915.9
Investments and Other Assets    
Unconsolidated affiliates 279.4 243.3
Other investments 189.1 194.4
Total Investments and Other Assets 468.5 437.7
Current Assets    
Cash and cash equivalents 44.5 36.3
Restricted Cash 29.3 46.8
Accounts receivable (less reserve of $32.2 and $24.0, respectively) 716.5 907.3
Income tax receivable 6.4 130.9
Gas inventory 266.0 326.6
Underrecovered gas and fuel costs 0.6 45.0
Materials and supplies, at average cost 114.9 97.4
Electric production fuel, at average cost 38.8 71.7
Price risk management assets 39.6 92.2
Exchange gas receivable 81.1 51.5
Assets of discontinued operations and assets held for sale 0 26.7
Regulatory assets 145.5 162.8
Prepayments and other 224.4 357.2
Total Current Assets 1,707.6 2,352.4
Other Assets    
Price risk management assets 33.9 56.0
Regulatory assets 1,902.2 2,024.4
Goodwill 3,666.2 3,677.3
Intangible assets 281.2 286.6
Deferred charges and other 88.1 94.4
Total Other Assets 5,971.6 6,138.7
Total Assets 21,621.6 21,844.7
Common Stockholders' Equity    
Common stock - $0.01 par value, 400,000,000 shares authorized; 312,420,078 and 310,280,867 shares outstanding, respectively 3.1 3.1
Additional paid-in capital 4,646.0 4,597.6
Retained earnings 1,164.1 1,059.6
Accumulated other comprehensive loss (62.0) (65.5)
Treasury stock (48.5) (40.5)
Total Common Stockholders' Equity 5,702.7 5,554.3
Long-term debt, excluding amounts due within one year 7,616.7 6,819.1
Total Capitalization 13,319.4 12,373.4
Current Liabilities    
Current portion of long-term debt 70.7 507.2
Short-term borrowings 377.7 776.9
Accounts payable 393.0 538.9
Dividends payable 78.1 0
Customer deposits and credits 164.7 269.6
Taxes accrued 202.1 235.5
Interest accrued 125.2 133.7
Overrecovered gas and fuel costs 64.6 22.1
Price risk management liabilities 47.5 95.2
Exchange gas payable 126.3 146.2
Deferred revenue 5.1 42.8
Regulatory liabilities 80.0 171.6
Accrued liability for postretirement and postemployment benefits 6.1 6.1
Liabilities of discontinued operations and liabilities held for sale 0 3.9
Legal and environmental reserves 43.1 42.2
Other accruals 283.8 309.7
Total Current Liabilities 2,068.0 3,301.6
Other Liabilities and Deferred Credits    
Price risk management liabilities 5.0 20.3
Deferred income taxes 3,062.7 2,953.3
Deferred investment tax credits 22.9 24.8
Deferred credits 92.1 84.1
Noncurrent deferred revenue 37.2 0
Accrued liability for postretirement and postemployment benefits 1,020.3 1,107.3
Regulatory liabilities and other removal costs 1,610.5 1,593.3
Asset retirement obligations 167.1 160.4
Other noncurrent liabilities 216.4 226.2
Total Other Liabilities and Deferred Credits 6,234.2 6,169.7
Commitments and Contingencies 0 0
Total Capitalization and Liabilities $ 21,621.6 $ 21,844.7