Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Cost Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Details)

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Supplemental Oil and Gas Disclosures - Cost Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Costs incurred: (1)      
Proved properties acquisitions [1] $ 2.2 $ 8.1 $ 223.8
Exploration (2) (3) [1],[2],[3] 47.3 7.4 30.6
Development [1] 18.4 23.6 114.5
Total costs incurred in oil and gas property acquisition, exploration and development activities [1] $ 67.9 $ 39.1 $ 368.9
[1] Includes net additions from capitalized ARO of $36.2 million, $15.2 million, and $37.5 million during 2021, 2020, and 2019, respectively. These adjustments for ARO are associated with acquisitions, liabilities incurred, divestitures and revisions of estimates.
[2] Includes geological and geophysical costs charged to expense of $5.7 million, $4.5 million, and $5.7 million during 2021, 2020, and 2019, respectively.
[3] Includes seismic costs of $0.1 million, $0.3 million, and $7.8 million incurred during 2021, 2020, and 2019, respectively.