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Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2018

Recurring Basis

Fair value measurements

Schedule of Assets and Liabilities Measured at Fair Value


		Quoted Prices in			Significant Other			Significant
		Active Markets for			Observable			Unobservable
		Identical Assets			Inputs			Inputs				Aggregate
As at December 31, 2018		(Level 1)			(Level 2)			(Level 3)				Fair Value
Receivables from provisional concentrate sales		$	—		$	8.5		$	—			$	8.5
Equity investments			132.8			—			3.9				136.7
Warrants			—			0.7			—				0.7
		$	132.8		$	9.2		$	3.9			$	145.9


		Quoted Prices in			Significant Other			Significant
		Active Markets for			Observable			Unobservable
		Identical Assets			Inputs			Inputs				Aggregate
As at December 31, 2017		(Level 1)			(Level 2)			(Level 3)				Fair Value
Cash and cash equivalents		$	511.1		$	—		$	—			$	511.1
Receivables from provisional concentrate sales			—			11.3			—				11.3
Available-for-sale equity investments			168.1			—			—				168.1
Warrants			—			0.8			—				0.8
		$	679.2		$	12.1		$	—			$	691.3

Non recurring Basis

Fair value measurements

Schedule of Assets Measured at Fair Value on a Non-Recurring Basis


		Quoted Prices in						Significant
		Active Markets for			Significant Other			Unobservable
		Identical Assets			Observable Inputs			Inputs				Aggregate
As at December 31, 2018		(Level 1)			(Level 2)			(Level 3)				Fair Value
Royalty, stream and working interests		$	—		$	—		$	14.6			$	14.6
		$	—		$	—		$	14.6			$	14.6