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LEASES - Lease Costs and Other Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
LEASES.    
Operating lease costs $ 34.5 $ 30.0
Weighted average remaining lease term (years) 8 years 7 months 6 days 10 years 2 months 12 days
Weighted average discount rate 3.40% 3.10%
Cash paid for amounts included in the measurement of lease liabilities $ 24.9 $ 20.9
Right of use assets obtained in exchange for lease liabilities $ 44.5 $ 24.4