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EXPENSES (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finance costs    
Interest on senior unsecured notes $ 53.2 $ 54.4
Interest on Credit Facility 9.0 5.9
Accretion expense on decommissioning obligations (Note 17) 2.0 1.0
Gain on modification of long-term debt 0.0 (3.3)
Other finance costs 4.8 6.1
Interest expense 69.0 64.1
Less: amounts included in cost of qualifying assets 0.0 (51.3)
Total finance costs 69.0 12.8
Finance income    
Interest income $ 1.5 $ 1.1