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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, 2020
Dec. 31, 2019
Jan. 01, 2019
Changes from financing cash flows      
Balance at the beginning $ 1,925.6 $ 1,811.2  
Debt issued 950.0 300.0  
Debt repayments (850.0) (200.0)  
Interest paid (63.1) (55.6)  
Payments of lease liabilities (20.7) (14.3)  
Changes for financing cash flows 1,941.8 1,841.3  
Other changes      
Interest expense and accretion 86.6 74.0  
Capitalized interest 49.1 47.4  
Capitalized interest paid (47.9) (45.0)  
Additions of lease liabilities 38.2 22.9  
Accretion of lease liabilities 3.0 2.9  
Other cash changes (26.6) (10.0)  
Other non cash changes (11.9) (7.9)  
Other changes 90.5 84.3  
Balance at the end 2,032.3 1,925.6  
Total lease liabilities 2,032.3 1,925.6  
Long-term debt      
Changes from financing cash flows      
Balance at the beginning 1,837.4 1,735.0  
Debt issued 950.0 300.0  
Debt repayments (850.0) (200.0)  
Changes for financing cash flows 1,937.4 1,835.0  
Other changes      
Other cash changes (12.8)    
Other non cash changes (0.7) 2.4  
Other changes (13.5) 2.4  
Balance at the end 1,923.9 1,837.4  
Total lease liabilities 1,923.9 1,837.4  
Lease liabilities      
Changes from financing cash flows      
Balance at the beginning 54.9 42.9  
Payments of lease liabilities (20.7) (14.3)  
Changes for financing cash flows 34.2 28.6  
Other changes      
Additions of lease liabilities 38.2 22.9  
Accretion of lease liabilities 3.0 2.9  
Other non cash changes (0.7) 0.5  
Other changes 40.5 26.3  
Balance at the end 74.7 54.9  
Total lease liabilities 74.7 54.9  
Accrued interest payable      
Changes from financing cash flows      
Balance at the beginning 33.3 33.3  
Interest paid (63.1) (55.6)  
Changes for financing cash flows (29.8) (22.3)  
Other changes      
Interest expense and accretion 86.6 74.0  
Capitalized interest 49.1 47.4  
Capitalized interest paid (47.9) (45.0)  
Other cash changes (13.8) (10.0)  
Other non cash changes (10.5) (10.8)  
Other changes 63.5 55.6  
Balance at the end 33.7 33.3  
Total lease liabilities $ 33.7 $ 33.3  
IFRS 16 | Lease liabilities      
Other changes      
Total lease liabilities     $ 42.9