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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Consolidated Balance Sheets (Additional Information) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Cumulative full cost ceiling limitation impairment charges	$ 8,200.0	$ 3,700.0
Royalty Trusts
Variable Interest Entity [Line Items]
Reserves for future expenses	3.0	3.0
Cumulative full cost ceiling limitation impairment charges	$ 976.2	$ 42.3

X

- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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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No definition available.

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- Details

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