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Commitments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments and Contingencies Disclosure [Line Items] |  |  |
Operating lease rental payments due in 2018 | $ 73.7 |  |
Operating lease rental payments due in 2019 | 65.6 |  |
Operating lease rental payments due in 2020 | 62.4 |  |
Operating lease rental payments due in 2021 | 61.3 |  |
Operating lease rental payments due in 2022 | 27.8 |  |
Rental expenses for non-cancellable lease, including contingent payments | 72.6 | $ 77.5 | $ 111.4
Commitments for capital expenditures | 432.3 |  |
Malaysia [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 197.3 |  |
Kaybob Duvernay Lands, Alberta [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 129.4 |  |
Eagle Ford Shale [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 31.8 |  |
Mexico [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 31.3 |  |
Gulf Of Mexico [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | $ 24.0 |  |
Rig contract cancellation period | 30 days |  |
Vietnam [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | $ 8.8 |  |
Brunei [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 6.3 |  |
Drilling Rigs And Associated Equipment [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 66.6 |  |
Processing Production Handling and Transportation Services [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Operating lease rental payments due in 2018 | 57.8 |  |
Operating lease rental payments due in 2019 | 63.8 |  |
Operating lease rental payments due in 2020 | 77.9 |  |
Operating lease rental payments due in 2021 | 91.9 |  |
Operating lease rental payments due in 2022 | 78.5 |  |
Processing and transportation charges | $ 53.8 | $ 50.3 | $ 32.5

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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