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Property, Plant and Equipment Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Proved Oil And Gas Properties
Business Acquisition [Line Items]
Estimate of future asset retirement costs	$ 41.6	$ 40.5
Property, Plant and Equipment, Other Types
Business Acquisition [Line Items]
Estimate of future asset retirement costs	$ 1.4	$ 1.3

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- 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.

+ References

No definition available.

+ Details

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- Definition

The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447

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