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Divestitures - Narrative (Details) - USD ($) $ in Millions				3 Months Ended		9 Months Ended
	May 28, 2021	May 21, 2021	May 01, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Divestitures [Line Items]
Proceeds from sale of assets						$ 0.0	$ 379.1
Loss on non-cancelable purchase commitment							5.2
Loss on inventory						$ 0.0	6.5
Disposed of by sale | Myriad myPath LLC laboratory
Divestitures [Line Items]
Proceeds from sale of assets	$ 32.5
Net gain on sale of assets adjusted for transaction fees					$ 31.2
(Loss) gain on divestiture				$ 0.0			31.2
Disposed of by sale | Myriad Autoimmune Assets
Divestitures [Line Items]
Proceeds from sale of business			$ 150.0
(Loss) gain on divestiture				(0.6)			(0.6)
Disposed of by sale | Myriad RBM, Inc.
Divestitures [Line Items]
Proceeds from sale of business		$ 197.0
(Loss) gain on divestiture				$ 121.0			$ 121.0

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