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Supplemental Oil and Gas Information - Costs 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
Property acquisition costs |  |  |
Unproved | $ 547.0 | $ 3.0 | $ 63.4
Proved | 733.1 | 794.3 | 7.7
Total acquisition costs | 1,280.1 | 797.3 | 71.1
Cost Incurred, Refunded Exploration Costs |  |  | 79.2
Exploration costs | 118.6 | 126.0 |
Development costs | 1,282.4 | 1,390.0 | 819.0
Total costs incurred | 2,681.1 | 2,313.3 | 969.3
Charged to expense |  |  |
Dry hole expense |  | 20.6 | (4.2)
Geophysical and other costs | 54.3 | 47.4 | 65.2
Total charged to expense | 54.3 | 68.0 | 61.0
Property additions | 2,626.8 | 2,245.3 | 908.3
United States |  |  |
Property acquisition costs |  |  |
Unproved | 533.8 | 2.8 | 50.4
Proved | 733.1 | 794.3 | 7.7
Total acquisition costs | 1,266.9 | 797.1 | 58.1
Cost Incurred, Refunded Exploration Costs |  |  | 13.7
Exploration costs | 44.8 | 88.1 |
Development costs | 979.0 | 853.7 | 508.4
Total costs incurred | 2,290.7 | 1,738.9 | 580.2
Charged to expense |  |  |
Dry hole expense |  | 16.0 | (1.9)
Geophysical and other costs | 21.6 | 13.4 | 9.7
Total charged to expense | 21.6 | 29.4 | 7.8
Property additions | 2,269.1 | 1,709.5 | 572.4
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
Cost Incurred, Refunded Exploration Costs |  |  | 0.6
Exploration costs | 6.4 | 0.6 |
Development costs | 281.8 | 373.8 | 273.8
Total costs incurred | 288.4 | 374.4 | 274.4
Charged to expense |  |  |
Dry hole expense |  | 0.0 | 0.0
Geophysical and other costs | 0.5 | 0.6 | 0.5
Total charged to expense | 0.5 | 0.6 | 0.5
Property additions | 287.9 | 373.8 | 273.9
Malaysia |  |  |
Property acquisition costs |  |  |
Unproved | 0.0 | 0.0 | 0.0
Proved | 0.0 | 0.0 | 0.0
Total acquisition costs | 0.0 | 0.0 | 0.0
Cost Incurred, Refunded Exploration Costs |  |  | (8.9)
Exploration costs | 0.0 | 2.2 |
Development costs | 0.0 | 145.9 | 35.7
Total costs incurred | 0.0 | 148.1 | 26.8
Charged to expense |  |  |
Dry hole expense |  | 0.1 | 0.7
Geophysical and other costs | 0.0 | 2.1 | 1.7
Total charged to expense | 0.0 | 2.2 | 2.4
Property additions | 0.0 | 145.9 | 24.4
Other |  |  |
Property acquisition costs |  |  |
Unproved | 13.0 | 0.2 | 13.0
Proved | 0.0 | 0.0 | 0.0
Total acquisition costs | 13.0 | 0.2 | 13.0
Cost Incurred, Refunded Exploration Costs |  |  | 73.8
Exploration costs | 67.4 | 35.1 |
Development costs | 21.6 | 16.6 | 1.1
Total costs incurred | 102.0 | 51.9 | 87.9
Charged to expense |  |  |
Dry hole expense |  | 4.5 | (3.0)
Geophysical and other costs | 32.2 | 31.3 | 53.3
Total charged to expense | 32.2 | 35.8 | 50.3
Property additions | 69.8 | 16.1 | 37.6
Asset retirement obligations |  |  |
Property acquisition costs |  |  |
Exploration costs | 0.0 | 0.0 | 0.0
Development costs | 79.6 | 373.5 | 52.3
Total costs incurred | 79.6 | 373.5 | 52.3
Asset retirement obligations | United States |  |  |
Property acquisition costs |  |  |
Exploration costs | 0.0 | 0.0 | 0.0
Development costs | 75.8 | 366.0 | 37.6
Total costs incurred | 75.8 | 366.0 | 37.6
Asset retirement obligations | Canada |  |  |
Property acquisition costs |  |  |
Exploration costs | 0.0 | 0.0 | 0.0
Development costs | 3.8 | 0.0 | 6.3
Total costs incurred | 3.8 | 0.0 | 6.3
Asset retirement obligations | Malaysia |  |  |
Property acquisition costs |  |  |
Exploration costs | 0.0 | 0.0 | 0.0
Development costs | 0.0 | 7.3 | 8.4
Total costs incurred | 0.0 | 7.3 | 8.4
Asset retirement obligations | Other |  |  |
Property acquisition costs |  |  |
Exploration costs | 0.0 | 0.0 | 0.0
Development costs | 0.0 | 0.2 | 0.0
Total costs incurred | $ 0.0 | $ 0.2 | $ 0.0

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