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Nonmonetary Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) a	Dec. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($) a
Nonmonetary Transactions [Abstract]
Acreage Exchanged | a	535	2,200	2,650
Carrying value of properties exchanged	$ 6.5	$ 73.4	$ 95.1
Basis of Accounting for Assets Transferred	carryover	carryover	carryover
Gain (Loss) Recognized on Transfer	$ 0.0	$ 0.0	$ 0.0

X

- Definition

Acreage exchanged through non-monetary trades.

+ References

No definition available.

+ Details

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X

- Definition

The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586

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X

- Definition

Disclosure of the accounting treatment and method of measurement for nonmonetary exchanges of assets or liabilities or related to a transfer of nonmonetary assets for which the Entity receives no assets in return.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 845
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68069686&loc=d3e32049-108421

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X

- Definition

Disclosure of the difference in values (gain (loss)) between the nonmonetary assets or liabilities exchanged with another entity inclusive of boot (small monetary consideration).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 845
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457341&loc=d3e32102-108422

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 845
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68069686&loc=d3e32049-108421

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- References

No definition available.

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