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LEASES (Lease Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating lease costs:      
Total operating lease costs $ 35.7 $ 33.6 $ 34.8
Finance lease costs:      
Amortization of ROU assets 0.8 0.0 0.0
Interest on lease liabilities 0.2 0.0 0.0
Total finance lease costs 1.0 0.0 0.0
Total lease costs 36.7 33.6 34.8
Cost of revenues      
Operating lease costs:      
Total operating lease costs 10.0 8.4 10.1
Software development      
Operating lease costs:      
Total operating lease costs 6.3 7.2 6.9
Selling and marketing (excluding customer base amortization)      
Operating lease costs:      
Total operating lease costs 15.4 12.6 11.9
General and administrative      
Operating lease costs:      
Total operating lease costs $ 4.0 $ 5.4 $ 5.9