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Fair Value of Assets and Liabilities - Schedule of Group's Assets and Liabilities Measured at Fair Value by Level Within the Fair Value Hierarchy (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets measured at fair value |  |
Listed investments | $ 99.0 | $ 10.5
Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Listed investments | 99.0 | 10.5
Trade receivables from provisional copper concentrate sales [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Trade receivables from provisional copper and gold | 21.2 | 10.6
Warrant [Member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 5.5 | 5.9
Oil derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 14.1 | 0.0
Gold derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 10.9 | 0.0
Copper derivatives [member] |  |
Liabilities measured at fair value |  |
Copper derivative contracts | 3.3 |
Copper derivatives [member] | Recurring fair value measurement [member] |  |
Liabilities measured at fair value |  |
Copper derivative contracts | 3.3 | 0.0
Level 1 of Fair Value Hierarchy [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Listed investments | 99.0 | 10.5
Level 1 of Fair Value Hierarchy [member] | Trade receivables from provisional copper concentrate sales [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Trade receivables from provisional copper and gold | 0.0 | 0.0
Level 1 of Fair Value Hierarchy [member] | Warrant [Member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 0.0 | 0.0
Level 1 of Fair Value Hierarchy [member] | Oil derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 0.0 | 0.0
Level 1 of Fair Value Hierarchy [member] | Gold derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 0.0 | 0.0
Level 1 of Fair Value Hierarchy [member] | Copper derivatives [member] | Recurring fair value measurement [member] |  |
Liabilities measured at fair value |  |
Copper derivative contracts | 0.0 | 0.0
Level 2 of Fair Value Hierarchy [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Listed investments | 0.0 | 0.0
Level 2 of Fair Value Hierarchy [member] | Trade receivables from provisional copper concentrate sales [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Trade receivables from provisional copper and gold | 21.2 | 10.6
Level 2 of Fair Value Hierarchy [member] | Warrant [Member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 5.5 | 5.9
Level 2 of Fair Value Hierarchy [member] | Oil derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 14.1 | 0.0
Level 2 of Fair Value Hierarchy [member] | Gold derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 10.9 | 0.0
Level 2 of Fair Value Hierarchy [member] | Copper derivatives [member] | Recurring fair value measurement [member] |  |
Liabilities measured at fair value |  |
Copper derivative contracts | 3.3 | 0.0
Level 3 of Fair Value Hierarchy [Member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Listed investments | 0.0 | 0.0
Level 3 of Fair Value Hierarchy [Member] | Trade receivables from provisional copper concentrate sales [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Trade receivables from provisional copper and gold | 0.0 | 0.0
Level 3 of Fair Value Hierarchy [Member] | Warrant [Member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 0.0 | 0.0
Level 3 of Fair Value Hierarchy [Member] | Oil derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 0.0 | 0.0
Level 3 of Fair Value Hierarchy [Member] | Gold derivatives [member] | Recurring fair value measurement [member] |  |
Assets measured at fair value |  |
Derivative Instruments | 0.0 | 0.0
Level 3 of Fair Value Hierarchy [Member] | Copper derivatives [member] | Recurring fair value measurement [member] |  |
Liabilities measured at fair value |  |
Copper derivative contracts | $ 0.0 | $ 0.0

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