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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income (loss) attributable to Myriad Genetics, Inc. stockholders $ 24.6 $ (15.2) $ (19.6) $ (185.8)
Unrealized gain (loss) on available-for-sale debt securities, net of tax (0.2) (0.2) (0.5) 0.5
Change in foreign currency translation adjustment, net of tax (0.2) 1.8 (1.6) 1.1
Comprehensive income (loss) 24.2 (13.6) (21.7) (184.2)
Comprehensive income (loss) attributable to Myriad Genetics, Inc. stockholders $ 24.2 $ (13.6) $ (21.7) $ (184.2)