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Segment and Related Information - Total Operating Loss for Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting [Abstract]            
Total operating loss for reportable segments $ (20.8)   $ (68.3)   $ (67.5) $ (202.0)
Interest income 0.2   0.5   0.4 1.3
Interest expense (2.0)   (3.1)   (5.0) (5.4)
Other 18.8   12.4   18.7 16.5
Loss before income tax (3.8)   (58.5)   (53.4) (189.6)
Income tax expense (benefit) 0.9   (3.0)   (9.2) (18.9)
Net loss (4.7)   (55.5)   (44.2) (170.7)
Net loss attributable to non-controlling interest 0.0   (0.1)   0.0 (0.1)
Net loss attributable to Myriad Genetics, Inc. stockholders $ (4.7) $ (39.5) $ (55.4) $ (115.2) $ (44.2) $ (170.6)