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CONSOLIDATED BALANCE SHEETS (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 1,383.0 $ 1,207.0
Accounts receivable - net 360.2 269.4
Inventories - net 229.6 304.2
Other 23.9 18.0
Total current assets 1,996.7 1,798.6
Property, plant and equipment, net of accumulated depreciation, depletion and amortization of $2,614.3 and $2,447.5 3,700.8 3,736.0
Asset retirement obligation funds 147.6 145.4
Investments in and advances to affiliates 944.3 928.6
Investments in auction rate securities 55.5 70.9
Goodwill 2,064.5 2,064.5
Other assets 209.5 230.5
Total assets 9,118.9 8,974.5
Current liabilities:    
Accounts payable and accrued expenses 334.4 327.7
Income taxes payable 1.3 128.5
Customer advances 121.0 257.2
Deferred income taxes 45.7 90.1
Distributions payable to noncontrolling interest   149.7
Other 52.9 78.0
Total current liabilities 555.3 1,031.2
Notes payable 4.8 4.8
Long-term debt 1,600.0 1,613.0
Deferred income taxes 1,017.3 956.8
Other noncurrent liabilities 441.3 435.8
Contingencies (Note 22)      
Stockholders' equity:    
Preferred stock - $0.01 par value, 50,000,000 shares authorized      
Common stock - $0.01 par value, 500,000,000 shares authorized, 2012 - 62,643,637 and 2011 - 71,935,838 shares issued 0.6 0.7
Paid-in capital 2,456.5 2,804.8
Retained earnings 2,637.5 2,841.0
Treasury stock - at cost, 2012 - 0 shares and 2011 - 6,515,251 shares   (1,000.2)
Accumulated other comprehensive loss (75.2) (99.3)
Total stockholders' equity 5,019.4 4,547.0
Noncontrolling interest 480.8 385.9
Total equity 5,500.2 4,932.9
Total liabilities and equity $ 9,118.9 $ 8,974.5