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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Additional Information) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entity
Cumulative full cost ceiling limitation impairment	$ 6,300.0	$ 3,700.0
Royalty Trusts
Variable Interest Entity
Reserves for expenses	3.0	3.0
Cumulative full cost ceiling limitation impairment	$ 547.5	$ 42.3

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- Definition

Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation.

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- Definition

Reserves held by the trustee for future general and administrative expenses.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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