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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) attributable to Myriad Genetics, Inc. stockholders	$ 81.1	$ (1.2)
Unrealized gain (loss) on available-for-sale securities, net of tax		(0.4)
Change in foreign currency translation adjustment, net of tax	3.3	4.3
Comprehensive income	84.4	2.7
Comprehensive income attributable to non-controlling interest	0.0	0.0
Comprehensive income attributable to Myriad Genetics, Inc. shareholders	$ 84.4	$ 2.7

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