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PROPERTY AND EQUIPMENT, NET - Former headquarters location (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Property and Equipment, Net    
Property held and used $ 108.2 $ 105.2
Land 2.3 2.3
Property and equipment 108.2 $ 105.2
Former Chicago Headquarters Location    
Property and Equipment, Net    
Property held and used 9.8  
Land 2.3  
Property and equipment $ 7.5