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RELATED PARTY TRANSACTIONS (Details) - Key Managment - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related party transactions    
Cash compensation - salaries, short-term incentives, and other benefits $ 7.4 $ 7.3
Long-term incentives, including share-based payments 8.8 8.5
Termination and post-retirement benefits 1.1 10.2
Total compensation paid to key management personnel $ 17.3 $ 26.0