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Divestitures - Narrative (Details) - USD ($) $ in Millions				6 Months Ended	12 Months Ended
	Sep. 13, 2021	Jul. 01, 2021	May 28, 2021	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2020
Disposal of Subsidiary [Line Items]
Loss on non-cancelable purchase commitment						$ 5.2
Loss on inventory				$ 0.0	$ 0.0	6.5	$ 0.0
Disposed of by Sale | Myriad myPath LLC laboratory
Disposal of Subsidiary [Line Items]
Proceeds from sale of assets			$ 32.5
Net gain on sale of assets adjusted for transaction fees			31.2
Transaction costs			$ 1.3
Gain (loss) on sale of subsidiary						31.2
Disposed of by Sale | Myriad RBM, Inc.
Disposal of Subsidiary [Line Items]
Transaction costs		$ 4.8
Proceeds from sale of business		197.0
Gain (loss) on sale of subsidiary		$ 121.0				121.0
Disposed of by Sale | Myriad Autoimmune Assets
Disposal of Subsidiary [Line Items]
Transaction costs	$ 4.4
Proceeds from sale of business	150.0
Gain (loss) on sale of subsidiary	$ (0.6)					$ (0.6)

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