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Exploration and Evaluation Assets
 12 Months Ended
Dec. 31, 2019
Exploration For And Evaluation Of Mineral Resources [Abstract]  
Exploration and Evaluation Assets
EXPLORATION AND EVALUATION ASSETS
($ millions)
2019

 
2018

 
Exploration and evaluation assets at cost
1,848.1

 
2,325.0

 
Accumulated amortization
(1,602.6
)
 
(1,852.4
)
 
Net carrying amount
245.5

 
472.6

 
 
 
 
 
 
Reconciliation of movements during the year
 
 
 
 
Cost, beginning of year
2,325.0

 
2,305.1

 
Accumulated amortization, beginning of year
(1,852.4
)
 
(1,670.2
)
 
Net carrying amount, beginning of year
472.6

 
634.9

 
 
 
 
 
 
Net carrying amount, beginning of year
472.6

 
634.9

 
Acquisitions through business combinations, net
7.3

 
10.2

 
Additions
384.9

 
673.3

 
Dispositions
(101.9
)
 
(7.5
)
 
Transfers to property, plant and equipment
(380.6
)
 
(705.9
)
 
Amortization
(129.1
)
 
(157.2
)
 
Foreign exchange
(7.7
)
 
24.8

 
Net carrying amount, end of year
245.5

 
472.6

 
Impairment test of exploration and evaluation assets
There were no indicators of impairment at December 31, 2019.