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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total revenue $ 211.5 $ 183.5 $ 413.7 $ 364.7
U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 194.8 162.4 378.0 323.2
RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 16.7 21.1 35.7 41.5
Hereditary Cancer        
Disaggregation of Revenue [Line Items]        
Total revenue 91.5 76.7 179.6 152.4
Hereditary Cancer | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 80.9 64.5 157.2 128.5
Hereditary Cancer | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 10.6 12.2 22.4 23.9
Tumor Profiling        
Disaggregation of Revenue [Line Items]        
Total revenue 32.6 36.0 63.5 73.3
Tumor Profiling | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 26.7 27.3 50.6 56.1
Tumor Profiling | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 5.9 8.7 12.9 17.2
Prenatal        
Disaggregation of Revenue [Line Items]        
Total revenue 44.4 35.6 88.7 71.8
Prenatal | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 44.2 35.4 88.3 71.4
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 43.0 35.2 81.9 67.2
Pharmacogenomics | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 43.0 35.2 81.9 67.2
Pharmacogenomics | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0