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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, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Total revenue $ 181.2 $ 164.9
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 160.8 141.7
RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 20.4 23.2
Hereditary Cancer    
Disaggregation of Revenue [Line Items]    
Total revenue 75.7 70.9
Hereditary Cancer | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 64.0 60.7
Hereditary Cancer | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 11.7 10.2
Tumor Profiling    
Disaggregation of Revenue [Line Items]    
Total revenue 37.3 32.5
Tumor Profiling | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 28.8 19.7
Tumor Profiling | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 8.5 12.8
Prenatal    
Disaggregation of Revenue [Line Items]    
Total revenue 36.2 31.9
Prenatal | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 36.0 31.7
Prenatal | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.2 0.2
Pharmacogenomics    
Disaggregation of Revenue [Line Items]    
Total revenue 32.0 29.3
Pharmacogenomics | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 32.0 29.3
Pharmacogenomics | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.0
Other    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.3
Other | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.3
Other | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue $ 0.0 $ 0.0