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Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net loss attributable to Myriad Genetics, Inc. stockholders	$ (14.1)	$ (4.7)	$ (34.6)	$ (44.2)
Unrealized loss on available-for-sale debt securities, net of tax	(0.8)	(0.1)	(2.1)	(0.3)
Change in foreign currency translation adjustment, net of tax	(0.5)	(0.3)	(1.7)	(1.4)
Comprehensive loss	(15.4)	(5.1)	(38.4)	(45.9)
Comprehensive loss attributable to Myriad Genetics, Inc. stockholders	$ (15.4)	$ (5.1)	$ (38.4)	$ (45.9)

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