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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Total revenue $ 183.5 $ 179.3 $ 364.7 $ 344.2
U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 162.4 157.5 323.2 299.2
RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 21.1 21.8 41.5 45.0
Hereditary Cancer        
Disaggregation of Revenue [Line Items]        
Total revenue 76.7 79.4 152.4 150.3
Hereditary Cancer | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 64.5 69.8 128.5 130.5
Hereditary Cancer | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 12.2 9.6 23.9 19.8
Tumor Profiling        
Disaggregation of Revenue [Line Items]        
Total revenue 36.0 33.5 73.3 66.0
Tumor Profiling | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 27.3 21.5 56.1 41.2
Tumor Profiling | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 8.7 12.0 17.2 24.8
Prenatal        
Disaggregation of Revenue [Line Items]        
Total revenue 35.6 33.3 71.8 65.2
Prenatal | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 35.4 33.1 71.4 64.8
Prenatal | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 0.2 0.2 0.4 0.4
Pharmacogenomics        
Disaggregation of Revenue [Line Items]        
Total revenue 35.2 33.1 67.2 62.4
Pharmacogenomics | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 35.2 33.1 67.2 62.4
Pharmacogenomics | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue $ 0.0 $ 0.0 0.0 0.0
Autoimmune        
Disaggregation of Revenue [Line Items]        
Total revenue     0.0 0.3
Autoimmune | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue     0.0 0.3
Autoimmune | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue     $ 0.0 $ 0.0