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Supplemental Oil and Gas Information (Unaudited) - Schedule of Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property acquisition costs |  |  |
Unproved | $ 8.0 | $ 8.5 | $ 1.8
Proved | 0.0 | 27.1 | 128.5
Total acquisition costs | 8.0 | 35.6 | 130.3
Exploration costs | 145.9 | 198.1 | 113.3
Development costs | 781.5 | 880.8 | 917.7
Total costs incurred | 935.4 | 1,114.5 | 1,161.3
Charged to expense |  |  |
Dry hole expense | 73.2 | 169.8 | 82.1
Geophysical and other costs | 50.8 | 54.1 | 37.7
Total charged to expense | 124.0 | 223.9 | 119.8
Property additions | 811.4 | 890.6 | 1,041.5
United States - Offshore |  |  |
Property acquisition costs |  |  |
Unproved | 7.8 | 0.0 | 1.8
Proved | 0.0 | 12.8 | 128.5
Total acquisition costs | 7.8 | 12.8 | 130.3
Exploration costs | 85.3 | 157.8 | 42.2
Development costs | 598.7 | 667.2 | 704.9
Total costs incurred | 691.8 | 837.8 | 877.4
Charged to expense |  |  |
Dry hole expense | 70.9 | 153.1 | 23.0
Geophysical and other costs | 19.2 | 13.4 | 15.8
Total charged to expense | 90.1 | 166.5 | 38.8
Property additions | 601.7 | 671.3 | 838.6
Canada |  |  |
Property acquisition costs |  |  |
Unproved | 0.2 | 0.0 | 0.0
Proved | 0.0 | 0.0 | 0.0
Total acquisition costs | 0.2 | 0.0 | 0.0
Exploration costs | 0.4 | 0.4 | 0.8
Development costs | 137.7 | 206.2 | 208.5
Total costs incurred | 138.3 | 206.6 | 209.3
Charged to expense |  |  |
Dry hole expense | 0.0 | 0.0 | 0.0
Geophysical and other costs | 0.4 | 0.4 | 0.8
Total charged to expense | 0.4 | 0.4 | 0.8
Property additions | 137.9 | 206.2 | 208.5
Other |  |  |
Property acquisition costs |  |  |
Unproved | 0.0 | 8.5 | 0.0
Proved | 0.0 | 14.3 | 0.0
Total acquisition costs | 0.0 | 22.8 | 0.0
Exploration costs | 60.2 | 39.9 | 70.3
Development costs | 45.1 | 7.4 | 4.3
Total costs incurred | 105.3 | 70.1 | 74.6
Charged to expense |  |  |
Dry hole expense | 2.3 | 16.7 | 59.1
Geophysical and other costs | 31.2 | 40.3 | 21.1
Total charged to expense | 33.5 | 57.0 | 80.2
Property additions | $ 71.8 | $ 13.1 | $ (5.6)

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- Definition Amount of acquisition cost incurred for property with proved and unproved reserves in oil- and gas-producing activities. Includes capitalized cost and cost charged to expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-20 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-20 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-19 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-18 + Details
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