Annual report pursuant to Section 13 and 15(d)

Note 20 - Supplemental Oil and Gas Disclosures - Cost Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Details)

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Note 20 - 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, 2019
Dec. 31, 2018
Dec. 31, 2017
Costs incurred: (1)      
Proved properties acquisitions [1] $ 223.8 $ 24.1 $ 1.1
Exploration (2) (3) [1],[2],[3] 30.6 49.9 62.0
Development [1] 114.5 56.2 92.5
Total costs incurred in oil and gas property acquisition, exploration and development activities [1] $ 368.9 $ 130.2 $ 155.6
[1] Includes net additions from capitalized ARO of $x.x million, $20.3 million and $21.3 million during 2019, 2018 and 2017, 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 $x.x million, $5.4 million and $4.2 million during 2019, 2018 and 2017, respectively.
[3] Includes seismic costs of $x.x million, $1.5 million and $0.5 million incurred during 2019, 2018 and 2017, respectively.