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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Jan. 01, 2019
Dec. 31, 2018
Fair value of derivative financial instruments | Increase (decrease) due to application of IFRS 9      
Impact of adoption on the accounting pronouncements      
Unrealized change in fair value of cost of hedging $ 3.1    
IFRS 9 | Equity securities      
Impact of adoption on the accounting pronouncements      
Impact of adopting IFRS 9, before tax     $ 44.1
Impact of adopting IFRS 9, (net of tax)     $ 39.4
IFRS 16 | Minimum      
Impact of adoption on the accounting pronouncements      
Lease liabilities   $ 75.0  
Right of use assets   75.0  
IFRS 16 | Maximum      
Impact of adoption on the accounting pronouncements      
Lease liabilities   95.0  
Right of use assets   $ 95.0