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CHANGES IN SIGNIFICANT ACCOUNTING POLICIES - Transition to IFRS 16 (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Changes in accounting policies      
Property, plant and equipment $ 6,340.0   $ 5,519.1
Right-of-use assets 54.1    
Current portion of lease liabilities 16.0 $ 7.3  
Long-term lease liabilities $ 38.9 35.6  
Property, plant and equipment      
Changes in accounting policies      
Right-of-use assets   5,562.0 $ 5,519.1
IFRS 16      
Changes in accounting policies      
Right-of-use assets   42.9  
Current portion of lease liabilities   7.3  
Long-term lease liabilities   35.6  
IFRS 16 | Property, plant and equipment      
Changes in accounting policies      
Right-of-use assets   $ 42.9