CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 2,221.3	$ 1,207.0
Accounts receivable - net	340.9	269.4
Inventories - net	310.0	304.2
Prepaid income taxes	118.1
Other	24.9	18.0
Total current assets	3,015.2	1,798.6
Property, plant and equipment, net of accumulated depreciation, depletion and amortization of $2,712.4 and $2,447.5	3,721.8	3,736.0
Asset retirement obligation funds	147.6	145.4
Investments in and advances to affiliates	991.9	928.6
Goodwill	2,064.5	2,064.5
Other assets	241.7	301.4
Total assets	10,182.7	8,974.5
Current liabilities:
Accounts payable and accrued expenses	393.3	327.7
Income taxes payable	37.3	128.5
Customer advances	617.6	257.2
Deferred income taxes	91.3	90.1
Distributions payable to noncontrolling interest		149.7
Other	54.1	78.0
Total current liabilities	1,193.6	1,031.2
Notes payable	5.0	4.8
Long-term debt	1,600.0	1,613.0
Deferred income taxes	1,019.1	956.8
Other noncurrent liabilities	386.9	435.8
Contingencies (Note 21)
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 - 62,879,096 and 2011 - 71,935,838 shares issued	0.6	0.7
Paid-in capital	2,481.2	2,804.8
Retained earnings	3,015.7	2,841.0
Treasury stock - at cost, 2012 - 10,940 shares and 2011 - 6,515,251 shares	(2.3)	(1,000.2)
Accumulated other comprehensive loss	(37.9)	(99.3)
Total stockholders' equity	5,457.3	4,547.0
Noncontrolling interest	520.8	385.9
Total equity	5,978.1	4,932.9
Total liabilities and equity	$ 10,182.7	$ 8,974.5