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Divestitures - Other Income (Details) - USD ($) $ in Millions			6 Months Ended	12 Months Ended
	Sep. 13, 2021	Jul. 01, 2021	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2020
Disposal of Subsidiary [Line Items]
Total other income (expense)			$ (1.2)	$ 0.6	$ 139.3	$ 16.2
Disposed of by Sale
Disposal of Subsidiary [Line Items]
Loss on inventory					(11.7)
Other					(0.6)
Gain on sale of Myriad RBM, Inc. | Disposed of by Sale
Disposal of Subsidiary [Line Items]
Gain (loss) on sale of subsidiary		$ 121.0			121.0
Gain on sale of the Myriad myPath, LLC laboratory | Disposed of by Sale
Disposal of Subsidiary [Line Items]
Gain (loss) on sale of subsidiary					31.2
Loss on sale of Myriad Autoimmune assets | Disposed of by Sale
Disposal of Subsidiary [Line Items]
Gain (loss) on sale of subsidiary	$ (0.6)				$ (0.6)

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