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Divestitures - Other Income (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Sep. 13, 2021	Jul. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Divestitures [Line Items]
Total Other Income			$ 120.6	$ (1.6)	$ 139.3	$ 14.9
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 divestiture		$ 121.0	121.0		121.0
Myriad myPath LLC laboratory | Disposed of by sale
Divestitures [Line Items]
Gain (loss) on divestiture			0.0		31.2
Myriad Autoimmune assets | Disposed of by sale
Divestitures [Line Items]
Gain (loss) on divestiture	$ (0.6)		$ (0.6)		$ (0.6)

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