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Divestitures - Other Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Divestitures [Line Items]
Total other income	$ 0.5	$ 120.6	$ 0.6	$ 139.3
Disposed of by sale
Divestitures [Line Items]
Gain (loss) on inventory		0.8		(11.7)
Other		(0.6)		(0.6)
Myriad RBM, Inc. | Disposed of by sale
Divestitures [Line Items]
Gain (loss) on sale		121.0		121.0
Myriad myPath LLC laboratory | Disposed of by sale
Divestitures [Line Items]
Gain (loss) on sale		0.0		31.2
Myriad Autoimmune Assets | Disposed of by sale
Divestitures [Line Items]
Gain (loss) on sale		$ (0.6)		$ (0.6)

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