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LEASES - Lease Costs and Other Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
LEASES.        
Operating lease costs $ 6.7 $ 4.7 $ 19.2 $ 14.5
Weighted average remaining lease term (years) 11 years 2 months 12 days 12 years 7 months 6 days 11 years 2 months 12 days 12 years 7 months 6 days
Weighted average discount rate 3.30% 3.40% 3.30% 3.40%
Cash paid for amounts included in the measurement of lease liabilities $ 4.5 $ 3.2 $ 13.1 $ 8.6
Lease incentive for leasehold improvements       25.2
Right-of-use assets obtained in exchange for lease liabilities $ 3.3 $ 0.9 $ 14.0 $ 71.8