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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income attributable to Myriad Genetics, Inc. stockholders	$ 131.1	$ 20.5	$ 117.2
Unrealized gain (loss) on available-for-sale securities, net of tax	(0.4)	(0.6)	0.3
Change in pension liability	0.3	0.2	(0.2)
Change in foreign currency translation adjustment	1.6	4.4	(2.6)
Comprehensive income	$ 132.6	$ 24.5	$ 114.7

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