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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	[1]	Jun. 30, 2017	[1]
Statement Of Income And Comprehensive Income [Abstract]
Net income attributable to Myriad Genetics, Inc. stockholders	$ 4.6	$ 133.3		$ 17.4
Unrealized gain (loss) on available-for-sale securities, net of tax	1.2	(0.4)		(0.6)
Change in pension liability	0.6	0.3		0.2
Change in foreign currency translation adjustment	(3.1)	1.6		4.4
Comprehensive income	$ 3.3	$ 134.8		$ 21.4
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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