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LEASES - Lease Costs and Other Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
LEASES    
Operating lease costs $ 6.2 $ 4.9
Weighted average remaining lease term (years) 11 years 10 months 24 days 13 years 2 months 12 days
Weighted average discount rate 3.40% 3.50%
Cash paid for amounts included in the measurement of lease liabilities $ 4.1 $ 2.8
Lease incentive for leasehold improvements   20.4
Right-of-use assets obtained in exchange for lease liabilities $ 1.0 $ 64.2