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REVENUE - Schedule of Total Revenue by Type and by U.S versus Rest of World (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Total revenue $ 202.2 $ 181.2
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 183.2 160.8
RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 19.0 20.4
Hereditary Cancer    
Disaggregation of Revenue [Line Items]    
Total revenue 88.1 75.7
Hereditary Cancer | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 76.3 64.0
Hereditary Cancer | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 11.8 11.7
Tumor Profiling    
Disaggregation of Revenue [Line Items]    
Total revenue 30.9 37.3
Tumor Profiling | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 23.9 28.8
Tumor Profiling | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 7.0 8.5
Prenatal    
Disaggregation of Revenue [Line Items]    
Total revenue 44.3 36.2
Prenatal | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 44.1 36.0
Prenatal | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.2 0.2
Pharmacogenomics    
Disaggregation of Revenue [Line Items]    
Total revenue 38.9 32.0
Pharmacogenomics | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 38.9 32.0
Pharmacogenomics | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue $ 0.0 $ 0.0