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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss attributable to Myriad Genetics, Inc. stockholders	$ (15.2)	$ (20.6)
Unrealized loss on available-for-sale debt securities, net of tax	(0.2)	0.0
Change in foreign currency translation adjustment, net of tax	1.8	(2.2)
Comprehensive loss	(13.6)	(22.8)
Comprehensive loss attributable to non-controlling interest	0.0	0.0
Comprehensive loss attributable to Myriad Genetics, Inc. shareholders	$ (13.6)	$ (22.8)

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