Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash provided by (used in) operating activities	$ 314,200	$ 259,355
Investing Activities
Acquisition of ICG, net of cash acquired	(2,910,380)
Change in restricted cash	(74,814)
Capital expenditures	(107,725)	(171,958)
Proceeds from dispositions of property, plant and equipment	1,411	229
Purchases of investments and advances to affiliates	(38,059)	(14,249)
Additions to prepaid royalties	(25,212)	(23,466)
Cash used in investing activities	(3,154,779)	(209,444)
Financing Activities
Proceeds from the issuance of $2.0 billion in aggregate principal amount of senior notes	2,000,000
Proceeds from the sale of common stock	1,249,407
Payments to retire ICG debt	(307,984)
Increase in restricted cash for retirement of ICG debt	(260,663)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	303,096	(15,555)
Net (payments) and proceeds from other debt	(8,845)	(8,249)
Debt financing costs	(112,334)	(437)
Dividends paid	(34,192)	(30,870)
Issuance of common stock under incentive plans	846	137
Contribution from noncontrolling interest		891
Cash provided by (used in) financing activities	2,829,331	(54,083)
Increase (decrease) in cash and cash equivalents	(11,248)	(4,172)
Cash and cash equivalents, beginning of period	93,593	61,138
Cash and cash equivalents, end of period	82,345	56,966
Parent/Issuer [Member]
Cash provided by (used in) operating activities	(109,358)	(134,960)
Investing Activities
Acquisition of ICG, net of cash acquired	(2,910,380)
Change in restricted cash	(74,814)
Capital expenditures	(2,459)	(1,006)
Purchases of investments and advances to affiliates	(725,938)	(11,303)
Cash used in investing activities	(3,713,591)	(12,309)
Financing Activities
Proceeds from the issuance of $2.0 billion in aggregate principal amount of senior notes	2,000,000
Proceeds from the sale of common stock	1,249,407
Net increase (decrease) in borrowings under lines of credit and commercial paper program	360,000	(55,000)
Net (payments) and proceeds from other debt	(8,845)	(8,249)
Debt financing costs	(112,326)	(32)
Dividends paid	(34,192)	(30,870)
Issuance of common stock under incentive plans	846	137
Transactions with affiliates, net	363,696	211,424
Cash provided by (used in) financing activities	3,818,586	117,410
Increase (decrease) in cash and cash equivalents	(4,363)	(29,859)
Cash and cash equivalents, beginning of period	13,713	54,255
Cash and cash equivalents, end of period	9,350	24,396
Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	278,596	240,408
Investing Activities
Capital expenditures	(65,927)	(123,761)
Proceeds from dispositions of property, plant and equipment	1,315	155
Purchases of investments and advances to affiliates	(27,058)	(2,946)
Additions to prepaid royalties	(21,440)	(20,831)
Cash used in investing activities	(113,110)	(147,383)
Financing Activities
Contributions from parent	714,937
Payments to retire ICG debt	(307,984)
Increase in restricted cash for retirement of ICG debt	(260,663)
Transactions with affiliates, net	(309,706)	(93,025)
Cash provided by (used in) financing activities	(163,416)	(93,025)
Increase (decrease) in cash and cash equivalents	2,070
Cash and cash equivalents, beginning of period	64	64
Cash and cash equivalents, end of period	2,134	64
Non-Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	144,962	153,907
Investing Activities
Capital expenditures	(39,339)	(47,191)
Proceeds from dispositions of property, plant and equipment	96	74
Additions to prepaid royalties	(3,772)	(2,635)
Cash used in investing activities	(43,015)	(49,752)
Financing Activities
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(56,904)	39,445
Debt financing costs	(8)	(405)
Contribution from noncontrolling interest		891
Transactions with affiliates, net	(53,990)	(118,399)
Cash provided by (used in) financing activities	(110,902)	(78,468)
Increase (decrease) in cash and cash equivalents	(8,955)	25,687
Cash and cash equivalents, beginning of period	79,816	6,819
Cash and cash equivalents, end of period	70,861	32,506
Eliminations [Member]
Investing Activities
Purchases of investments and advances to affiliates	714,937
Cash used in investing activities	714,937
Financing Activities
Contributions from parent	(714,937)
Cash provided by (used in) financing activities	$ (714,937)

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The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The increase (decrease) in economic resources obtained through long-term financing, include increases (decreases) in other long-term debt not otherwise defined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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-Publisher FASB
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 16
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Publisher FASB
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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