Fair value measurements (Details) - USD ($)	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Fair value measurements
Transfer from Level 1 to 2 of financial assets	$ 0
Transfer from Level 2 to 1 of financial assets	0
Transfer from Level 1 to 2 of financial liabilities	0
Transfer from Level 2 to 1 of financial liabilities	0
Transfers Into Level 3 of financial assets	0
Transfers Out of Level 3 of financial assets	0
Transfers Into Level 3 of financial liabilities	0
Transfers Out of Level 3 of financial liabilities	0
Assets	5,358,700,000	$ 4,931,800,000
Recurring Basis
Fair value measurements
Financial assets, at fair value	205,400,000	145,900,000
Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	187,900,000	132,800,000
Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	13,600,000	9,200,000
Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	3,900,000	3,900,000
Non recurring Basis
Fair value measurements
Financial assets, at fair value		14,600,000
Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value		14,600,000
Receivables from provisional concentrate sales \| Recurring Basis
Fair value measurements
Financial assets, at fair value	12,600,000	8,500,000
Receivables from provisional concentrate sales \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	12,600,000	8,500,000
Equity investments \| Recurring Basis
Fair value measurements
Financial assets, at fair value	191,800,000	136,700,000
Equity investments \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	187,900,000	132,800,000
Equity investments \| Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	3,900,000	3,900,000
Warrants \| Recurring Basis
Fair value measurements
Financial assets, at fair value	1,000,000	700,000
Warrants \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	$ 1,000,000	700,000
Royalty stream and working interests \| Non recurring Basis
Fair value measurements
Financial assets, at fair value		14,600,000
Royalty stream and working interests \| Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value		$ 14,600,000

The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity.

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