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LEASES - Lease Costs and Other Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
LEASES.    
Operating lease costs $ 25.6 $ 20.2
Weighted average remaining lease term (years) 11 years 1 month 6 days 12 years 1 month 6 days
Weighted average discount rate 3.30% 3.40%
Cash paid for amounts included in the measurement of lease liabilities $ 17.2 $ 11.1
Lease incentive for leasehold improvements   25.2
Right-of-use assets obtained in exchange for lease liabilities $ 14.1 $ 68.9