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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to Myriad Genetics, Inc. stockholders	$ (53.1)	$ (199.5)	$ 4.6	$ 133.3
Unrealized gain (loss) on available-for-sale securities, net of tax	(0.5)	0.7	1.2	(0.4)
Change in pension liability	0.0	0.0	0.6	0.3
Change in foreign currency translation adjustment	3.4	(0.6)	(3.1)	1.6
Comprehensive income (loss)	$ (50.2)	$ (199.4)	$ 3.3	$ 134.8

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