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Revenue - Total Revenue by Category and by US versus Rest of World (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Total revenue $ 164.9 $ 173.1
U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 141.7 154.7
RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 23.2 18.4
Molecular diagnostic testing    
Disaggregation of Revenue [Line Items]    
Total revenue 164.9 159.6
Molecular diagnostic testing | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 141.7 141.2
Molecular diagnostic testing | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 23.2 18.4
Molecular diagnostic - Hereditary Cancer    
Disaggregation of Revenue [Line Items]    
Total revenue 70.9 76.1
Molecular diagnostic - Hereditary Cancer | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 60.7 65.1
Molecular diagnostic - Hereditary Cancer | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 10.2 11.0
Molecular diagnostic - Tumor Profiling    
Disaggregation of Revenue [Line Items]    
Total revenue 32.5 31.0
Molecular diagnostic - Tumor Profiling | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 19.7 24.2
Molecular diagnostic - Tumor Profiling | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 12.8 6.8
Molecular diagnostic - Prenatal    
Disaggregation of Revenue [Line Items]    
Total revenue 31.9 23.7
Molecular diagnostic - Prenatal | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 31.7 23.6
Molecular diagnostic - Prenatal | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.2 0.1
Molecular Diagnostic - Pharmacogenomics    
Disaggregation of Revenue [Line Items]    
Total revenue 29.3 17.6
Molecular Diagnostic - Pharmacogenomics | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 29.3 17.6
Molecular Diagnostic - Pharmacogenomics | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.0
Molecular Diagnostic - Autoimmune    
Disaggregation of Revenue [Line Items]    
Total revenue 0.3 10.7
Molecular Diagnostic - Autoimmune | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 0.3 10.7
Molecular Diagnostic - Autoimmune | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.0
Molecular diagnostic - Other    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.5
Molecular diagnostic - Other | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.0
Molecular diagnostic - Other | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 0.5
Pharmaceutical and clinical services    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 13.5
Pharmaceutical and clinical services | U.S.    
Disaggregation of Revenue [Line Items]    
Total revenue 0.0 13.5
Pharmaceutical and clinical services | RoW    
Disaggregation of Revenue [Line Items]    
Total revenue $ 0.0 $ 0.0