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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Property acquisition costs |  |  |  |
Unproved | $ 1.8 | $ 8.8 | $ 14.3 |
Proved | 128.5 | (0.5) | 0.2 |
Total acquisition costs | 130.3 | 8.3 | 14.5 |
Refunded exploration costs |  |  | 58.6 |
Exploration costs | 113.3 | 62.2 |  |
Development costs | 917.7 | 619.3 | 736.8 |
Total costs incurred | 1,161.3 | 689.8 | 809.9 |
Charged to expense |  |  |  |
Dry hole expense | 82.1 | 17.3 |  |
Geophysical and other costs | 37.7 | 32.8 | 38.6 |
Total charged to expense | 119.8 | 50.1 | 38.6 |
Property additions | $ 1,041.4 | 639.7 | 771.3 |
Terra Nova |  |  |  |
Charged to expense |  |  |  |
Additional percentage acquired through commercial settlement | 7.525% |  |  | 7.525%
U.S. |  |  |  |
Property acquisition costs |  |  |  |
Unproved | $ 1.8 | 8.8 | 6.5 |
Proved | 128.5 | 19.9 | 0.2 |
Total acquisition costs | 130.3 | 28.7 | 6.7 |
Refunded exploration costs |  |  | 34.3 |
Exploration costs | 42.2 | 31.7 |  |
Development costs | 704.9 | 513.2 | 609.2 |
Total costs incurred | 877.4 | 573.6 | 650.2 |
Charged to expense |  |  |  |
Dry hole expense | 23.0 | 17.3 |  |
Geophysical and other costs | 15.8 | 13.1 | 14.3 |
Total charged to expense | 38.8 | 30.4 | 14.3 |
Property additions | 838.6 | 543.2 | 635.9 |
Canada |  |  |  |
Property acquisition costs |  |  |  |
Unproved | 0.0 | 0.0 | 0.5 |
Proved | 0.0 | (20.4) | 0.0 |
Total acquisition costs | 0.0 | (20.4) | 0.5 |
Refunded exploration costs |  |  | (0.4) |
Exploration costs | 0.8 | 0.4 |  |
Development costs | 208.5 | 102.4 | 120.8 |
Total costs incurred | 209.3 | 82.4 | 120.9 |
Charged to expense |  |  |  |
Dry hole expense | 0.0 | 0.0 |  |
Geophysical and other costs | 0.8 | 0.4 | 0.7 |
Total charged to expense | 0.8 | 0.4 | 0.7 |
Property additions | 208.5 | 82.0 | 120.2 |
Other |  |  |  |
Property acquisition costs |  |  |  |
Unproved | 0.0 | 0.0 | 7.3 |
Proved | 0.0 | 0.0 | 0.0 |
Total acquisition costs | 0.0 | 0.0 | 7.3 |
Refunded exploration costs |  |  | 24.7 |
Exploration costs | 70.3 | 30.1 |  |
Development costs | 4.3 | 3.7 | 6.8 |
Total costs incurred | 74.6 | 33.8 | 38.8 |
Charged to expense |  |  |  |
Dry hole expense | 59.1 | 0.0 |  |
Geophysical and other costs | 21.1 | 19.3 | 23.6 |
Total charged to expense | 80.2 | 19.3 | 23.6 |
Property additions | $ (5.7) | $ 14.5 | $ 15.2 |

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