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Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2018

Recurring Basis

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 September 30, 2018		(Level 1)			(Level 2)			(Level 3)				Fair Value
Receivables from provisional concentrate sales		$	—		$	8.6		$	—			$	8.6
Equity investments			161.3			—			3.9				165.2
Warrants			—			0.8			—				0.8
		$	161.3		$	9.4		$	3.9			$	174.6


		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