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IMPAIRMENT (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [abstract]          
Rainy River depletable mining properties       $ 1,054.8 $ 268.4
Tax recovery   $ 0.0 [1] $ (101.6) [1] (101.6) [1] (87.4)
Total impairment charge after tax $ 671.1 $ 671.1 $ 282.1 $ 953.2 $ 181.0
[1] There was no tax recovery associated with the impairment losses at Rainy River and Blackwater recorded during the fourth quarter of 2018 as the Company has not recognized any deferred tax assets as at December 31, 2018. Refer to Note 16 for further information.