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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Property and Equipment, Net          
Total property and equipment $ 354.3   $ 354.3   $ 342.6
Less accumulated depreciation (248.5)   (248.5)   (237.4)
Total property and equipment, net 105.8   105.8   105.2
Depreciation expense 8.6 $ 9.2 25.8 $ 24.8  
Construction in progress          
Property and Equipment, Net          
Total property and equipment 4.2   4.2   17.3
Building          
Property and Equipment, Net          
Total property and equipment 68.8   68.8   68.8
Furniture and equipment          
Property and Equipment, Net          
Total property and equipment $ 281.3   $ 281.3   $ 256.5