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Fair value measurements (Tables)

6 Months Ended

Jun. 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 June 30, 2018		(Level 1)			(Level 2)			(Level 3)				Fair Value
Receivables from provisional gold equivalent sales		$	—		$	7.1		$	—			$	7.1
Equity investments			142.9			—			4.0				146.9
Warrants			—			0.8			—				0.8
		$	142.9		$	7.9		$	4.0			$	154.8


		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 gold equivalent 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