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Other (Loss) Gain (Tables)
 12 Months Ended
Dec. 31, 2019
Other Gain (Loss) [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Other gain (loss) recorded in net earnings (loss) for the years ended:
 
December 31,
December 31,
 
2019
2018
Reduction of obligation to renounce flow-through exploration expenditures
$0.6

$0.6

Unrealized loss on non-hedging derivatives
(0.6
)
(0.4
)
Loss on disposal of assets
(0.7
)
(6.1
)
Gain on Sale of non-core royalties (i)
8.0

—

Other
(2.2
)
(2.5
)
 
$5.1

($8.4
)
(i)    Sale of non-core royalties