Copper derivative contracts.

No definition available.

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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.

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No definition available.

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Financial assets measured at fair value.

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No definition available.

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Financial assets not measured at fair value.

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No definition available.

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Financial liabilities measured at fair value.

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No definition available.

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- Definition

Financial liabilities not measured at fair value.

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No definition available.

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- Definition

Gold and oil derivative contracts.

+ References

No definition available.

+ Details

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- Definition

Trade receivables from provisional copper and gold concentrate sales.

+ References

No definition available.

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

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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]

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- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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The amount of liabilities related to finance leases.

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- Definition

The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

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The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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- Definition

The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

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The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables]

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Financial Instruments - Summary of Carrying Amounts and Fair Values of Financial Assets and Financial Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]
- Borrowings	$ 2,011.6	$ 1,781.5
- Trade and other payables	393.1	451.0
- Finance lease liabilities	111.5
- Environmental trust funds	60.8	55.5	$ 44.5
- Trade and other receivables	153.2	201.9
- Investments	235.3	104.6
- Cash and cash equivalents	399.7	479.0	$ 526.7	$ 440.0
- Warrants	9.3	5.5
Fair Value [member] \| Financial liabilities at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Copper derivative contracts	22.6	3.3
Total	22.6	3.3
Fair Value [member] \| Financial liabilities not measured at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Borrowings	2,001.8	1,805.1
- Trade and other payables	393.1	451.0
- Finance lease liabilities	88.6
Total	2,483.5	2,256.1
Fair Value [member] \| Financial assets at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	6.5	7.3
- Trade receivables from provisional copper sales	15.3	21.2
- Investments	93.1	99.1
Asanko redeemable preference shares	132.9
- Warrants	9.3	5.5
- Gold and oil derivative contracts	8.3	25.0
Total	265.4	158.1
Fair Value [member] \| Financial assets not measured at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	54.3	48.2
- Trade and other receivables	64.2	45.3
- Cash and cash equivalents	399.7	479.0
Total	518.2	572.5
Carrying amount [member] \| Financial liabilities at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Copper derivative contracts	22.6	3.3
Total	22.6	3.3
Carrying amount [member] \| Financial liabilities at fair value [member] \| Fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
- Copper derivative contracts	22.6	0.0
Total	22.6	0.0
Carrying amount [member] \| Financial liabilities at fair value [member] \| Derivative instruments [member]
Disclosure of detailed information about financial instruments [line items]
- Copper derivative contracts		3.3
Total		3.3
Carrying amount [member] \| Financial liabilities not measured at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Borrowings	2,011.6	1,781.5
- Trade and other payables	393.1	451.0
- Finance lease liabilities	88.6
Total	2,493.3	2,232.5
Carrying amount [member] \| Financial liabilities not measured at fair value [member] \| Other financial liabilities measured at amortised cost, category [member]
Disclosure of detailed information about financial instruments [line items]
- Borrowings	2,011.6
- Trade and other payables	393.1
- Finance lease liabilities	88.6
Total	2,493.3
Carrying amount [member] \| Financial liabilities not measured at fair value [member] \| Other Financial Instruments [member]
Disclosure of detailed information about financial instruments [line items]
- Borrowings		1,781.5
- Trade and other payables		451.0
Total		2,232.5
Carrying amount [member] \| Financial assets at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	6.5	7.3
- Trade receivables from provisional copper sales	15.3	21.2
- Investments	93.1	99.1
Asanko redeemable preference shares	132.9
- Warrants	9.3	5.5
- Gold and oil derivative contracts	8.3	25.0
Total	265.4	158.1
Carrying amount [member] \| Financial assets at fair value [member] \| Fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	6.5	7.3
- Trade receivables from provisional copper sales	15.3	21.2
- Investments	0.0	0.0
Asanko redeemable preference shares	0.0
- Warrants	9.3	0.0
- Gold and oil derivative contracts	8.3	0.0
Total	39.4	28.5
Carrying amount [member] \| Financial assets at fair value [member] \| FVOCI [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	0.0
- Trade receivables from provisional copper sales	0.0
- Investments	93.1
Asanko redeemable preference shares	132.9
- Warrants	0.0
- Gold and oil derivative contracts	0.0
Total	226.0
Carrying amount [member] \| Financial assets at fair value [member] \| Available for sale [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds		0.0
- Trade receivables from provisional copper sales		0.0
- Investments		99.1
- Warrants		0.0
- Gold and oil derivative contracts		0.0
Total		99.1
Carrying amount [member] \| Financial assets at fair value [member] \| Derivative instruments [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds		0.0
- Trade receivables from provisional copper sales		0.0
- Investments		0.0
- Warrants		5.5
- Gold and oil derivative contracts		25.0
Total		30.5
Carrying amount [member] \| Financial assets not measured at fair value [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	54.3	48.2
- Trade and other receivables	64.2	45.3
- Cash and cash equivalents	399.7	479.0
Total	518.2	572.5
Carrying amount [member] \| Financial assets not measured at fair value [member] \| Amortised cost [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds	54.3
- Trade and other receivables	64.2
- Cash and cash equivalents	399.7
Total	$ 518.2
Carrying amount [member] \| Financial assets not measured at fair value [member] \| Loans and receivables [member]
Disclosure of detailed information about financial instruments [line items]
- Environmental trust funds		48.2
- Trade and other receivables		45.3
- Cash and cash equivalents		479.0
Total		$ 572.5