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Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2017

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 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


		Quoted Prices in			Significant Other			Significant
		Active Markets for			Observable			Unobservable
		Identical Assets			Inputs			Inputs				Aggregate
As at December 31, 2016		(Level 1)			(Level 2)			(Level 3)				Fair Value
Cash and cash equivalents		$	253.0		$	—		$	—			$	253.0
Receivables from provisional gold equivalent sales			—			9.8			—				9.8
Available-for-sale equity investments			114.6			—			—				114.6
Warrants			—			0.9			—				0.9
		$	367.6		$	10.7		$	—			$	378.3

Non recurring Basis

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, 2017		(Level 1)			(Level 2)			(Level 3)				Fair Value
Royalty, stream and working interests		$	—		$	—		$	2.1			$	2.1
		$	—		$	—		$	2.1			$	2.1


		Quoted Prices in						Significant
		Active Markets for			Significant Other			Unobservable
		Identical Assets			Observable Inputs			Inputs				Aggregate
As at December 31, 2016		(Level 1)			(Level 2)			(Level 3)				Fair Value
Royalty, stream and working interests		$	—		$	—		$	2.1			$	2.1
		$	—		$	—		$	2.1			$	2.1