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Segment and Related Information - Segment Operating Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 154.6	$ 145.2	$ 93.2	$ 164.0	$ 195.1	$ 186.3	$ 215.4	$ 216.6	$ 216.8	$ 202.3	$ 299.8	$ 381.4	$ 638.6	$ 851.1	$ 743.7
Depreciation and amortization											35.8		72.0	73.0	54.4
Segment operating income (loss)	$ (48.2)	$ (39.6)	$ (68.3)	$ (133.7)	$ (8.8)	$ (20.9)	$ (5.6)	$ 5.9	$ 6.1	$ 1.2	(87.8)	$ (29.7)	(231.7)	7.6	121.9
Reportable segments | Diagnostic
Segment Reporting Information [Line Items]
Revenues											271.7		593.5	789.4	690.4
Depreciation and amortization											33.5		68.2	67.7	49.2
Segment operating income (loss)											(1.4)		(82.4)	133.3	142.6
Reportable segments | Other
Segment Reporting Information [Line Items]
Revenues											28.1		45.1	61.7	53.3
Depreciation and amortization											2.3		3.8	5.3	5.2
Segment operating income (loss)											$ (86.4)		$ (149.3)	$ (125.7)	$ (20.7)

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