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REVENUES - Schedule of Accounts Receivable, Unbilled Services and Unearned Revenue (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]    
Accounts receivable $ 389.9 $ 420.2
Unbilled services 587.1 600.0
Less: allowance for credit losses (36.0) (31.7)
Total 941.0 988.5
Unearned revenue $ 236.9 $ 214.2