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ACQUISITION OF EL PILAR MINE (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 06, 2015	Dec. 31, 2015	Dec. 31, 2014
Recognized amounts of identifiable assets acquired and liabilities assumed
Goodwill		$ 41.4	$ 17.0
El Pilar
Recognized amounts of identifiable assets acquired and liabilities assumed
Goodwill		24.4
Stingray
Acquisition of El Pilar mine
Percentage of ownership acquired (as a percent)	100.00%
Recognized amounts of identifiable assets acquired and liabilities assumed
Financial assets	$ 0.4
Mineral assets	93.0
Property, plant and equipment	10.5
Deferred income taxes	(24.7)
Financial liabilities	(3.6)
Total identifiable net assets	75.6
Goodwill	24.4
Total paid	$ 100.0	100.0
Stingray | El Pilar
Acquisition of El Pilar mine
Percentage of interest in mine concession	100.00%
Development investment	$ 300.0
Mine life	13 years
Period of construction	18 months
Stingray | El Pilar | Selling, general and administrative expenses
Acquisition of El Pilar mine
Acquisition related costs		$ 0.4

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Amount of legal right to explore, extract, and retain some or all portions of the benefits from mining or mineral deposits and properties used for mining acquired at the acquisition date.

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