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LEASES - Lease payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
LEASES    
Lease with a term of 12 months or less $ 4.8 $ 23.7
Leases of assets with underlying value, when new, of $5,000 or less 0.1 0.4
Leases with variable lease payments 31.2 23.3
Total $ 36.1 $ 47.4