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LONG-TERM DEBT AND CREDIT FACILITIES - Changes in liabilities arising from financing activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes from financing cash flows    
Balance at the beginning $ 1,768.3 $ 1,766.4
Debt issued 300.0 80.0
Debt repayments (200.0) (80.0)
Interest paid (55.6) (57.9)
Payments of lease liabilities (14.3)  
Changes for financing cash flows 1,841.3 1,708.5
Other changes    
Interest expense and accretion 74.0 72.1
Capitalized interest 47.4 41.5
Capitalized interest paid (45.0) (38.2)
Additions of lease liabilities 22.9  
Accretion of lease liabilities 2.9  
Other cash changes (10.0) (9.9)
Other non cash changes (7.9) (5.7)
Other changes 84.3 59.8
Balance at the end 1,925.6 1,768.3
Long-term debt    
Changes from financing cash flows    
Balance at the beginning 1,735.0 1,732.6
Debt issued 300.0 80.0
Debt repayments (200.0) (80.0)
Changes for financing cash flows 1,835.0 1,732.6
Other changes    
Other non cash changes 2.4 2.4
Other changes 2.4 2.4
Balance at the end 1,837.4 1,735.0
Lease liabilities    
Changes from financing cash flows    
Payments of lease liabilities (14.3)  
Changes for financing cash flows 28.6  
Other changes    
Additions of lease liabilities 22.9  
Accretion of lease liabilities 2.9  
Other non cash changes 0.5  
Other changes 26.3  
Balance at the end 54.9  
Accrued interest payable    
Changes from financing cash flows    
Balance at the beginning 33.3 33.8
Interest paid (55.6) (57.9)
Changes for financing cash flows (22.3) (24.1)
Other changes    
Interest expense and accretion 74.0 72.1
Capitalized interest 47.4 41.5
Capitalized interest paid (45.0) (38.2)
Other cash changes (10.0) (9.9)
Other non cash changes (10.8) (8.1)
Other changes 55.6 57.4
Balance at the end 33.3 33.3
IFRS 16    
Changes from financing cash flows    
Balance at the beginning 1,811.2  
Other changes    
Balance at the end   1,811.2
IFRS 16 | Long-term debt    
Changes from financing cash flows    
Balance at the beginning 1,735.0  
Other changes    
Balance at the end   1,735.0
IFRS 16 | Lease liabilities    
Changes from financing cash flows    
Balance at the beginning 42.9  
Other changes    
Balance at the end   42.9
IFRS 16 | Accrued interest payable    
Changes from financing cash flows    
Balance at the beginning $ 33.3  
Other changes    
Balance at the end   $ 33.3