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Segment and Related Information - Total Operating Income (Loss) for Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting [Abstract]    
Total operating loss for reportable segments $ (39.6) $ (20.9)
Interest income 0.4 0.9
Interest expense (2.9) (2.9)
Other (1.6) 0.6
Loss before income tax (43.7) (22.3)
Income tax benefit (28.5) (1.7)
Net loss (15.2) (20.6)
Net loss attributable to non-controlling interest 0.0 0.0
Net loss attributable to Myriad Genetics, Inc. stockholders $ (15.2) $ (20.6)