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Supplemental Oil and Gas Information (Capitalized Costs Relating to Oil and Gas Producing Activities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | $ 842.3 | $ 830.3
Proved oil and gas properties | 21,634.8 | 19,349.5
Gross capitalized costs | 22,477.1 | 20,179.8
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (368.2) | (402.0)
Proved oil and gas properties | (12,486.0) | (11,696.2)
Net capitalized costs | 9,622.9 | 8,081.6
United States [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 394.2 | 360.9
Proved oil and gas properties | 11,678.3 | 9,606.4
Gross capitalized costs | 12,072.5 | 9,967.3
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (129.3) | (149.5)
Proved oil and gas properties | (5,433.7) | (4,893.8)
Net capitalized costs | 6,509.5 | 4,924.0
Canada [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 250.0 | 286.8
Proved oil and gas properties | 3,693.0 | 3,603.4
Gross capitalized costs | 3,943.0 | 3,890.2
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (213.5) | (230.7)
Proved oil and gas properties | (2,088.8) | (2,027.9)
Net capitalized costs | 1,640.7 | 1,631.6
Malaysia [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 21.2 | 20.5
Proved oil and gas properties | 6,263.5 | 6,139.7
Gross capitalized costs | 6,284.7 | 6,160.2
Accumulated depreciation, depletion and amortization |  |
Proved oil and gas properties | (4,963.5) | (4,774.5)
Net capitalized costs | 1,321.2 | 1,385.7
Other Regions [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 176.9 | 162.1
Gross capitalized costs | 176.9 | 162.1
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (25.4) | (21.8)
Net capitalized costs | $ 151.5 | $ 140.3

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- Definition Capitalized Costs Accumulated Depreciation Depletion and Amortization for Relating to Oil and Gas Producing Activities Proved Properties. + References No definition available. + Details
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- Definition Capitalized Costs Accumulated Depreciation Depletion and Amortization for Relating to Oil and Gas Producing Activities Un proved Properties + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Net amount of capitalized costs relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -URI http://asc.fasb.org/topic&trid=2145477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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