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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss attributable to Myriad Genetics, Inc. stockholders	$ (39.5)	$ (115.2)
Unrealized loss on available-for-sale debt securities, net of tax	(0.2)	(0.1)
Change in foreign currency translation adjustment, net of tax	(1.1)	(2.5)
Comprehensive loss	(40.8)	(117.8)
Comprehensive loss attributable to non-controlling interest	0.0	0.0
Comprehensive loss attributable to Myriad Genetics, Inc. stockholders	$ (40.8)	$ (117.8)

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