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Segment and Related Information - Total Operating Loss for Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting [Abstract]    
Total operating loss for reportable segments $ (46.7) $ (133.7)
Interest income 0.2 0.8
Interest expense (3.0) (2.3)
Other (0.1) 4.1
Loss before income tax (49.6) (131.1)
Income tax benefit (10.1) (15.9)
Net loss (39.5) (115.2)
Net loss attributable to non-controlling interest 0.0 0.0
Net loss attributable to Myriad Genetics, Inc. stockholders $ (39.5) $ (115.2)