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LEASES - Lease payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
LEASES    
Lease with a term of 12 months or less $ 6.5 $ 4.8
Leases of low-value assets 0.3 0.1
Leases with variable lease payments 36.5 31.2
Total $ 43.3 $ 36.1