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Risk Management Activities - Summary of the Exposure to Credit Risk for Trade Receivables by Geographic Region (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |  |  |
Trade receivables pat due but not impaired | $ 0.1 | $ 0.0 |  |
Trade receivables impaired | 0.2 | 0.1 |  |
Cash and cash equivalents | 399.7 | 479.0 | $ 526.7 | $ 440.0
Environmental trust funds | 60.8 | 55.5 | $ 44.5 |
Banks and financial institutions [member] |  |  |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |  |  |
Environmental trust funds | $ 60.8 | $ 55.5 |  |

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- Definition The funds intended to fund environmental rehabilitation obligations of the entity and are not available for general purposes of the entity. + References No definition available. + Details
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- Definition Trade receivable impaired. + References No definition available. + Details
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- Definition Trade receivables past due but not impaired. + References No definition available. + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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