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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue $ 213.1 $ 211.5 $ 409.0 $ 413.7
U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 198.2 194.8 379.8 378.0
RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 14.9 16.7 29.2 35.7
Hereditary Cancer        
Disaggregation of Revenue [Line Items]        
Total revenue 96.3 91.5 182.6 179.6
Hereditary Cancer | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 84.6 80.9 160.0 157.2
Hereditary Cancer | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 11.7 10.6 22.6 22.4
Tumor Profiling        
Disaggregation of Revenue [Line Items]        
Total revenue 31.4 32.6 60.7 63.5
Tumor Profiling | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 28.3 26.7 54.3 50.6
Tumor Profiling | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 3.1 5.9 6.4 12.9
Prenatal        
Disaggregation of Revenue [Line Items]        
Total revenue 47.6 44.4 96.9 88.7
Prenatal | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 47.5 44.2 96.7 88.3
Prenatal | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue 0.1 0.2 0.2 0.4
Pharmacogenomics        
Disaggregation of Revenue [Line Items]        
Total revenue 37.8 43.0 68.8 81.9
Pharmacogenomics | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenue 37.8 43.0 68.8 81.9
Pharmacogenomics | RoW        
Disaggregation of Revenue [Line Items]        
Total revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0