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Supplemental Oil and Gas Information (Capitalized Costs Relating to Oil and Gas Producing Activities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | $ 830.3 | $ 849.0
Proved oil and gas properties | 19,349.5 | 19,774.0
Gross capitalized costs | 20,179.8 | 20,623.0
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (402.0) | (406.6)
Proved oil and gas properties | (11,696.2) | (12,049.7)
Net capitalized costs | 8,081.6 | 8,166.7
United States [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 360.9 | 360.8
Proved oil and gas properties | 9,606.4 | 9,384.6
Gross capitalized costs | 9,967.3 | 9,745.4
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (149.5) | (151.2)
Proved oil and gas properties | (4,893.8) | (4,605.9)
Net capitalized costs | 4,924.0 | 4,988.3
Canada [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 286.8 | 315.6
Proved oil and gas properties | 3,603.4 | 4,241.6
Gross capitalized costs | 3,890.2 | 4,557.2
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (230.7) | (233.6)
Proved oil and gas properties | (2,027.9) | (2,877.2)
Net capitalized costs | 1,631.6 | 1,446.4
Malaysia [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 20.5 | 47.0
Proved oil and gas properties | 6,139.7 | 6,147.8
Gross capitalized costs | 6,160.2 | 6,194.8
Accumulated depreciation, depletion and amortization |  |
Proved oil and gas properties | (4,774.5) | (4,566.6)
Net capitalized costs | 1,385.7 | 1,628.2
Other Regions [Member] |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and gas properties | 162.1 | 125.6
Gross capitalized costs | 162.1 | 125.6
Accumulated depreciation, depletion and amortization |  |
Unproved oil and gas properties | (21.8) | (21.8)
Net capitalized costs | $ 140.3 | $ 103.8

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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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