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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Long-term debt    
Principal amount $ 1,746.3  
Letters of credit and surety bonds 1,735.0 $ 1,732.6
EDC    
Long-term debt    
Maximum borrowing 300.0  
Loan amount utilized 227.4 215.2
Letters of credit and surety bonds $ 161.5 230.2
EDC | Minimum    
Long-term debt    
Borrowing fees 0.95%  
Surety bonds    
Long-term debt    
Principal amount $ 264.4 $ 254.7
Fees incured (as a percentage) 0.70%