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DISCONTINUED OPERATIONS - Mesquite (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
DISCONTINUED OPERATIONS      
Revenue   $ 630.6 $ 604.5
Operating expense   371.9 325.4
Revenue less cost of goods sold   18.1 39.2
Finance income   2.2 1.5
Finance costs   (62.6) (69.0)
Other losses   (5.6) 18.1
Impairment loss on held-for-sale assets $ (671.1) 0.0 (1,054.8)
Loss before taxes   (73.9) (1,096.0)
Loss from discontinued operations, net of tax [1]   $ 0.0 (154.9)
Discontinued operations [member]      
DISCONTINUED OPERATIONS      
Revenue     146.1
Operating expense     95.6
Depreciation and depletion     35.4
Revenue less cost of goods sold     15.1
Finance income     0.4
Finance costs     (0.4)
Other losses     0.0
Impairment loss on held-for-sale assets     (253.1)
Loss before taxes     (238.0)
Income tax recovery     83.9
Loss from discontinued operations, net of tax     $ (154.1)
[1] In the prior year period, Peak Mines and Mesquite were classified as discontinued operations and accordingly earnings and cash flows from continuing operations are presented exclusive of Peak Mines and Mesquite. Peak Mines was sold in April 2018 and Mesquite was sold in October 2018. Refer to Note 16 for further details.