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Net operating costs (excluding items shown separately) - Summary of net operating costs (excluding items shown separately) (Footnotes (Detail) £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£)
Disclosure Of Operating Costs [Line Items] |  |  |  |
Operating lease expenses |  | $ 787.0 | $ 555.0 |
Purchases of the other investors' share of production | $ 291.0 | 332.0 | 229.0 |
Payments for low value leases (12 months in duration) | (1.0) |  |  |
Short-term lease costs | 327.0 |  |  |
Payments for variable lease components | 15.0 |  |  |
Pre-tax gains on disposals of property, plant and equipment | $ 49.0 | 586.0 | 138.0 |
United Kingdoms Financial Conduct Authority (FCA) [Member] |  |  |  |
Disclosure Of Operating Costs [Line Items] |  |  |  |
Financial penalty |  |  | $ 36.4 | £ 27.4
Kitimat [Member] |  |  |  |
Disclosure Of Operating Costs [Line Items] |  |  |  |
Pre-tax gains on disposals of property, plant and equipment |  | $ 549.0 |  |

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- Definition The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Operating lease expenses. + References No definition available. + Details
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- Definition Purchases of other investors share of production accounted for using equity method investment. + References No definition available. + Details
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