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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related parties    
Related party transactions    
Cash compensation - Salaries, short-term incentives, and other benefits $ 8.6 $ 9.1
Long-term incentives, including share-based payments 9.3 8.7
Total compensation paid to key management personnel 17.9 17.8
Puren    
Related party transactions    
Dividends received $ 0.0 $ 0.0