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Supplemental Oil and Gas Information (Unaudited) - Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property acquisition costs |  |  |
Unproved | $ 8.5 | $ 1.8 | $ 8.8
Proved | 27.1 | 128.5 |
Proved |  |  | 0.5
Total acquisition costs | 35.6 | 130.3 | 8.3
Exploration costs | 198.1 | 113.3 | 62.2
Development costs | 880.8 | 917.7 | 619.3
Total costs incurred | 1,114.5 | 1,161.3 | 689.8
Charged to expense |  |  |
Dry hole expense | 169.8 | 82.1 | 17.3
Geophysical and other costs | 54.1 | 37.7 | 32.8
Total charged to expense | 223.9 | 119.8 | 50.1
Property additions | 890.6 | 1,041.5 | $ 639.7
Terra Nova |  |  |
Charged to expense |  |  |
Additional percentage acquired through commercial settlement |  |  | 7.525%
U.S. |  |  |
Property acquisition costs |  |  |
Unproved | 0.0 | 1.8 | $ 8.8
Proved | 12.8 | 128.5 | 19.9
Total acquisition costs | 12.8 | 130.3 | 28.7
Exploration costs | 157.8 | 42.2 | 31.7
Development costs | 667.2 | 704.9 | 513.2
Total costs incurred | 837.8 | 877.4 | 573.6
Charged to expense |  |  |
Dry hole expense | 153.1 | 23.0 | 17.3
Geophysical and other costs | 13.4 | 15.8 | 13.1
Total charged to expense | 166.5 | 38.8 | 30.4
Property additions | 671.3 | 838.6 | 543.2
Canada |  |  |
Property acquisition costs |  |  |
Unproved | 0.0 | 0.0 | 0.0
Proved | 0.0 | 0.0 |
Proved |  |  | 20.4
Total acquisition costs | 0.0 | 0.0 | 20.4
Exploration costs | 0.4 | 0.8 | 0.4
Development costs | 206.2 | 208.5 | 102.4
Total costs incurred | 206.6 | 209.3 | 82.4
Charged to expense |  |  |
Dry hole expense | 0.0 | 0.0 | 0.0
Geophysical and other costs | 0.4 | 0.8 | 0.4
Total charged to expense | 0.4 | 0.8 | 0.4
Property additions | 206.2 | 208.5 | 82.0
Other |  |  |
Property acquisition costs |  |  |
Unproved | 8.5 | 0.0 | 0.0
Proved | 14.3 | 0.0 | 0.0
Total acquisition costs | 22.8 | 0.0 | 0.0
Exploration costs | 39.9 | 70.3 | 30.1
Development costs | 7.4 | 4.3 | 3.7
Total costs incurred | 70.1 | 74.6 | 33.8
Charged to expense |  |  |
Dry hole expense | 16.7 | 59.1 | 0.0
Geophysical and other costs | 40.3 | 21.1 | 19.3
Total charged to expense | 57.0 | 80.2 | 19.3
Property additions | $ 13.1 | $ (5.6) | $ 14.5

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