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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) attributable to Myriad Genetics, Inc. stockholders	$ (20.6)	$ (0.7)
Unrealized gain (loss) on available-for-sale securities, net of tax	0.0	(0.2)
Change in foreign currency translation adjustment, net of tax	(2.2)	0.4
Comprehensive income (loss)	(22.8)	(0.5)
Comprehensive income attributable to non-controlling interest	0.0	0.0
Comprehensive income (loss) attributable to Myriad Genetics, Inc. shareholders	$ (22.8)	$ (0.5)

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