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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income attributable to Myriad Genetics, Inc. stockholders	$ 11.4	$ 4.2	$ 124.6	$ 9.0
Unrealized gain (loss) on available-for-sale securities, net of tax	(0.2)	0.1	(0.5)	(0.5)
Change in foreign currency translation adjustment, net of tax	4.4	3.2	7.8	(0.6)
Comprehensive income	15.6	7.5	131.9	7.9
Comprehensive income attributable to non-controlling interest	0.0	0.0	0.0	0.0
Comprehensive income attributable to Myriad Genetics, Inc. shareholders	$ 15.6	$ 7.5	$ 131.9	$ 7.9

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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