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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue $ 205.7 $ 213.3 $ 614.7 $ 627.0
U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 191.7 196.0 571.5 574.0
RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 14.0 17.3 43.2 53.0
Hereditary Cancer        
Disaggregation of Revenue [Line Items]        
Total revenue 93.0 90.5 275.6 270.1
Hereditary Cancer | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 81.8 78.4 241.8 235.6
Hereditary Cancer | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 11.2 12.1 33.8 34.5
Tumor Profiling        
Disaggregation of Revenue [Line Items]        
Total revenue 29.5 31.6 90.2 95.1
Tumor Profiling | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 26.7 26.5 81.0 77.1
Tumor Profiling | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 2.8 5.1 9.2 18.0
Prenatal        
Disaggregation of Revenue [Line Items]        
Total revenue 44.5 43.5 141.4 132.2
Prenatal | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 44.5 43.4 141.2 131.7
Prenatal | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 0.0 0.1 0.2 0.5
Pharmacogenomics        
Disaggregation of Revenue [Line Items]        
Total revenue 38.7 47.7 107.5 129.6
Pharmacogenomics | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 38.7 47.7 107.5 129.6
Pharmacogenomics | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0