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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, 2019	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Disposal of Subsidiary [Line Items]
Total Other Income			$ (1.2)	$ (0.3)	$ 139.3	$ 15.3	$ 16.2	$ 1.2
Disposed of by sale
Disposal of Subsidiary [Line Items]
Loss on inventory					(11.7)
Other					(0.6)
Myriad RBM, Inc. | Disposed of by sale
Disposal of Subsidiary [Line Items]
Gain (loss) on sale of subsidiary		$ 121.0			121.0
Myriad myPath LLC laboratory | Disposed of by sale
Disposal of Subsidiary [Line Items]
Gain (loss) on sale of subsidiary					31.2
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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