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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, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total revenue $ 195.9 $ 202.2
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 181.6 183.2
RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 14.3 19.0
Hereditary Cancer    
Disaggregation of Revenue [Line Items]    
Total revenue 86.3 88.1
Hereditary Cancer | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 75.4 76.3
Hereditary Cancer | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 10.9 11.8
Tumor Profiling    
Disaggregation of Revenue [Line Items]    
Total revenue 29.3 30.9
Tumor Profiling | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 26.0 23.9
Tumor Profiling | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 3.3 7.0
Prenatal    
Disaggregation of Revenue [Line Items]    
Total revenue 49.3 44.3
Prenatal | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 49.2 44.1
Prenatal | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.1 0.2
Pharmacogenomics    
Disaggregation of Revenue [Line Items]    
Total revenue 31.0 38.9
Pharmacogenomics | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 31.0 38.9
Pharmacogenomics | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue $ 0.0 $ 0.0