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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) attributable to Myriad Genetics, Inc. stockholders	$ (0.7)	$ 78.8
Unrealized gain (loss) on available-for-sale securities, net of tax	(0.2)	0.0
Change in foreign currency translation adjustment, net of tax	0.4	3.3
Comprehensive income (loss)	(0.5)	82.1
Comprehensive income attributable to non-controlling interest	0.0	0.0
Comprehensive income (loss) attributable to Myriad Genetics, Inc. shareholders	$ (0.5)	$ 82.1

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