Condensed Consolidating Financial Statements (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 1,713.3	$ 1,207.0	$ 1,134.1	$ 797.7
Accounts receivable - net	464.9	269.4
Inventories - net	265.5	304.2
Other	14.7	18.0
Total current assets	2,458.4	1,798.6
Property, plant and equipment - net	3,712.5	3,736.0
Asset retirement obligation funds	147.6	145.4
Investments in and advances to unconsolidated affiliates	934.7	928.6
Investments in auction rate securities	71.1	70.9
Goodwill	2,064.5	2,064.5
Other assets	228.1	230.5
Total assets	9,616.9	8,974.5
Current liabilities:
Accounts payable and accrued expenses	319.3	327.7
Income taxes payable	139.7	128.5
Customer advances	399.9	257.2
Deferred income taxes	106.7	90.1
Distributions payable to noncontrolling interest	153.1	149.7	80.2	78.0
Other	131.8	78.0
Total current liabilities	1,250.5	1,031.2
Notes payable	4.9	4.8
Long-term debt	1,613.0	1,613.0
Deferred income taxes	948.2	956.8
Other noncurrent liabilities	439.4	435.8
Stockholders' equity:
Preferred stock
Common stock	0.7	0.7
Paid-in capital	2,820.2	2,804.8
Retained earnings (accumulated deficit)	3,183.2	2,841.0
Treasury stock	(1,000.2)	(1,000.2)
Accumulated other comprehensive income (loss)	(72.0)	(99.3)	(26.8)	(53.3)
Total stockholders' equity	4,931.9	4,547.0
Noncontrolling interest	429.0	385.9	428.5	383.0
Total equity	5,360.9	4,932.9	4,791.6	4,433.4
Total liabilities and equity	9,616.9	8,974.5
Parent
Current assets:
Investments in and advances to unconsolidated affiliates	3,903.0	3,533.4
Due from affiliates	1,029.1	1,013.8
Total assets	4,932.1	4,547.2
Current liabilities:
Accounts payable and accrued expenses	0.1	0.1
Total current liabilities	0.1	0.1
Stockholders' equity:
Common stock	0.7	0.7
Paid-in capital	2,820.3	2,804.8
Retained earnings (accumulated deficit)	3,183.2	2,841.0
Treasury stock	(1,000.2)	(1,000.2)
Accumulated other comprehensive income (loss)	(72.0)	(99.2)
Total stockholders' equity	4,932.0	4,547.1
Total equity	4,932.0	4,547.1
Total liabilities and equity	4,932.1	4,547.2
CFI
Current assets:
Cash and cash equivalents	306.2	98.7	299.8	136.2
Accounts receivable - net	197.0	76.9
Inventories - net	184.5	212.6
Prepaid income taxes	348.1	289.4
Other	4.0	6.0
Total current assets	1,039.8	683.6
Property, plant and equipment - net	777.9	767.7
Asset retirement obligation funds	147.6	145.4
Investments in and advances to unconsolidated affiliates	5,661.6	5,484.7
Investments in auction rate securities	71.1	70.9
Goodwill	0.9	0.9
Deferred income taxes	44.6	26.1
Other assets	89.8	91.4
Total assets	7,833.3	7,270.7
Current liabilities:
Accounts payable and accrued expenses	226.8	216.3
Customer advances	290.5	184.3
Notes payable	300.0	300.0
Deferred income taxes	106.7	90.1
Other	108.5	66.0
Total current liabilities	1,032.5	856.7
Long-term debt	1,600.0	1,600.0
Due to Affiliates	1,030.4	1,014.8
Other noncurrent liabilities	267.4	265.8
Stockholders' equity:
Paid-in capital	739.8	739.9
Retained earnings (accumulated deficit)	3,235.2	2,892.7
Accumulated other comprehensive income (loss)	(72.0)	(99.2)
Total stockholders' equity	3,903.0	3,533.4
Total equity	3,903.0	3,533.4
Total liabilities and equity	7,833.3	7,270.7
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	573.7	300.2	196.7	164.0
Accounts receivable - net	409.0	367.4
Inventories - net	51.7	62.9
Other	5.5	6.6
Total current assets	1,039.9	737.1
Property, plant and equipment - net	1,563.2	1,592.4
Investments in and advances to unconsolidated affiliates	1,224.7	1,346.1
Due from affiliates	1,523.0	1,398.3
Goodwill	2,063.6	2,063.6
Other assets	111.5	113.8
Total assets	7,525.9	7,251.3
Current liabilities:
Accounts payable and accrued expenses	67.3	74.7
Income taxes payable	479.2	396.9
Customer advances	87.3	65.1
Total current liabilities	633.8	536.7
Long-term debt	13.0	13.0
Deferred income taxes	819.0	811.9
Other noncurrent liabilities	135.4	135.1
Stockholders' equity:
Common stock	153.1	153.1
Paid-in capital	4,450.2	4,450.2
Retained earnings (accumulated deficit)	946.1	795.2
Accumulated other comprehensive income (loss)	11.3	(13.1)
Total stockholders' equity	5,560.7	5,385.4
Noncontrolling interest	364.0	369.2
Total equity	5,924.7	5,754.6
Total liabilities and equity	7,525.9	7,251.3
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	833.4	808.1	637.6	497.5
Accounts receivable - net	566.7	439.0
Inventories - net	29.3	28.7
Other	5.2	5.4
Total current assets	1,434.6	1,281.2
Property, plant and equipment - net	1,371.4	1,375.9
Investments in and advances to unconsolidated affiliates	923.8	919.4
Other assets	26.8	25.3
Total assets	3,756.6	3,601.8
Current liabilities:
Accounts payable and accrued expenses	47.3	58.4
Income taxes payable	8.6	21.0
Customer advances	22.1	7.8
Distributions payable to noncontrolling interest	586.3	441.7
Other	23.3	12.0
Total current liabilities	687.6	540.9
Notes payable	14.5	14.2
Deferred income taxes	173.8	171.0
Due to Affiliates	1,521.7	1,397.3
Other noncurrent liabilities	36.6	34.9
Stockholders' equity:
Preferred stock	65.3	65.3
Common stock	4.3	33.2
Paid-in capital	987.2	1,098.0
Retained earnings (accumulated deficit)	248.3	263.3
Accumulated other comprehensive income (loss)	17.3	(16.3)
Total stockholders' equity	1,322.4	1,443.5
Total equity	1,322.4	1,443.5
Total liabilities and equity	3,756.6	3,601.8
Elimination
Current assets:
Accounts receivable - net	(707.8)	(613.9)
Prepaid income taxes	(348.1)	(289.4)
Total current assets	(1,055.9)	(903.3)
Investments in and advances to unconsolidated affiliates	(10,778.4)	(10,355.0)
Due from affiliates	(2,552.1)	(2,412.1)
Deferred income taxes	(44.6)	(26.1)
Total assets	(14,431.0)	(13,696.5)
Current liabilities:
Accounts payable and accrued expenses	(22.2)	(21.8)
Income taxes payable	(348.1)	(289.4)
Notes payable	(300.0)	(300.0)
Distributions payable to noncontrolling interest	(433.2)	(292.0)
Total current liabilities	(1,103.5)	(903.2)
Notes payable	(9.6)	(9.4)
Deferred income taxes	(44.6)	(26.1)
Due to Affiliates	(2,552.1)	(2,412.1)
Stockholders' equity:
Preferred stock	(65.3)	(65.3)
Common stock	(157.4)	(186.3)
Paid-in capital	(6,177.3)	(6,288.1)
Retained earnings (accumulated deficit)	(4,429.6)	(3,951.2)
Accumulated other comprehensive income (loss)	43.4	128.5
Total stockholders' equity	(10,786.2)	(10,362.4)
Noncontrolling interest	65.0	16.7
Total equity	(10,721.2)	(10,345.7)
Total liabilities and equity	$ (14,431.0)	$ (13,696.5)