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Segment and Related Information - Total Operating Loss for Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting [Abstract]                
Total operating loss for reportable segments $ (79.9)     $ (39.6)     $ (147.4) $ (241.6)
Interest income 0.2     0.4     0.6 1.7
Interest expense (1.1)     (2.9)     (6.1) (8.3)
Other 120.6     (1.6)     139.3 14.9
Income (loss) before income tax 39.8     (43.7)     (13.6) (233.3)
Income tax expense (benefit) 15.2     (28.5)     6.0 (47.4)
Net income (loss) 24.6     (15.2)     (19.6) (185.9)
Net loss attributable to non-controlling interest 0.0     0.0     0.0 (0.1)
Net income (loss) attributable to Myriad Genetics, Inc. stockholders $ 24.6 $ (4.7) $ (39.5) $ (15.2) $ (55.4) $ (115.2) $ (19.6) $ (185.8)