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DIVESTITURES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 13, 2021
Jul. 01, 2021
May 28, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disposal of Subsidiary [Line Items]            
Loss on non-cancelable purchase commitment           $ 5.2
Loss on inventory       $ 0.0 $ 0.0 6.5
Disposed of by Sale | Myriad myPath LLC laboratory            
Disposal of Subsidiary [Line Items]            
Proceeds from sale of assets     $ 32.5      
Net gain on sale of assets adjusted for transaction fees     31.2      
Transaction costs     $ 1.3      
Gain (loss) on sale of subsidiary           31.2
Disposed of by Sale | Myriad RBM, Inc.            
Disposal of Subsidiary [Line Items]            
Transaction costs   $ 4.8        
Proceeds from sale of business   197.0        
Gain (loss) on sale of subsidiary   $ 121.0       121.0
Disposed of by Sale | Myriad Autoimmune Assets            
Disposal of Subsidiary [Line Items]            
Transaction costs $ 4.4          
Proceeds from sale of business 150.0          
Gain (loss) on sale of subsidiary $ (0.6)         $ (0.6)