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Supplemental Oil and Gas Information - Capitalized Costs Relating to Oil and Gas Producing Activities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | $ 1,570.7 | $ 821.1
Proved oil and natural gas properties | 17,490.4 | 15,371.3
Gross capitalized costs | 19,061.1 | 16,192.4
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (387.7) | (368.2)
Proved oil and natural gas properties | (8,739.9) | (7,522.5)
Net capitalized costs | 9,933.5 | 8,301.7
United States |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | 1,116.6 | 394.2
Proved oil and natural gas properties | 13,292.6 | 11,678.3
Gross capitalized costs | 14,409.2 | 12,072.5
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (136.4) | (129.3)
Proved oil and natural gas properties | (6,298.9) | (5,433.7)
Net capitalized costs | 7,973.9 | 6,509.5
Canada |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | 243.7 | 250.0
Proved oil and natural gas properties | 4,176.7 | 3,693.0
Gross capitalized costs | 4,420.4 | 3,943.0
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (225.4) | (213.5)
Proved oil and natural gas properties | (2,438.6) | (2,088.8)
Net capitalized costs | 1,756.4 | 1,640.7
Other |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | 210.4 | 176.9
Proved oil and natural gas properties | 21.1 | 0.0
Gross capitalized costs | 231.5 | 176.9
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (25.9) | (25.4)
Proved oil and natural gas properties | (2.4) | 0.0
Net capitalized costs | $ 203.2 | $ 151.5

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- Definition The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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