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Net operating costs (excluding items shown separately) - Summary of net operating costs (excluding items shown separately) (Parenthetical) (Detail) £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure Of Operating Costs [Line Items] |  |  |  |
Impact of (Increase)/decrease in finished goods and work in progress |  |  | $ 304.0 | $ 143.0
Purchases of the other investors' share of production | $ 229.0 |  | 383.0 | $ 378.0
Operating lease expense | 555.0 |  | $ 541.0 |
United Kingdoms Financial Conduct Authority (FCA) [Member] |  |  |  |
Disclosure Of Operating Costs [Line Items] |  |  |  |
Financial penalty | $ 36.4 | £ 27.4 |  |

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- Definition The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2016-01-13 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_35_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Disclosure of operating costs. + References No definition available. + Details
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- Definition Financial penalty payment. + References No definition available. + Details
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- Definition Impact of changes in inventories of finished goods and work in progress. + 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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- Details
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