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Other (Loss) Gain (Tables)
 12 Months Ended
Dec. 31, 2017
Other Gain (Loss) [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Other (loss) gain recorded in net earnings (loss) for the years ended:
 
December 31,
December 31,
 
2017
2016
Reduction of obligation to renounce flow-through exploration expenditures
$2.3

$1.3

Unrealized (loss) gain on non-hedged derivatives
(0.3
)
1.6

Fair value adjustment on prepayment option embedded derivative
—

9.5

Loss on disposal of assets
(1.9
)
(4.6
)
Interest income
2.5

2.1

Transaction costs related to the Richmont acquisition (note 5)
(3.8
)
—

Share-based compensation related of replacement awards related to Richmont (note 5)
(1.3
)
—

Other
1.9

(2.3
)
 
($0.6
)
$7.6