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PROPERTY, BUILDINGS AND EQUIPMENT - SCHEDULE OF PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization $ (502.5) $ (425.8)
Property, buildings and equipment, net 423.6 402.7
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization 195.4 104.1
Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, buildings and equipment, gross 202.6 169.5
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, buildings and equipment, gross 359.9 304.7
Software and Software Development Costs [Member]    
Property, Plant and Equipment [Line Items]    
Property, buildings and equipment, gross 292.6 272.6
Depreciable [Member]    
Property, Plant and Equipment [Line Items]    
Property, buildings and equipment, gross 855.1 746.7
Property, buildings and equipment, net 352.6 320.9
Land    
Property, Plant and Equipment [Line Items]    
Property, buildings and equipment, gross 25.0 24.6
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, buildings and equipment, gross $ 46.0 $ 57.1