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Segment and Related Information - Schedule of Segment Performance Based on Income (Loss) before Interest Income and Other Income and Expense (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 195.1	$ 216.8	$ 381.4	$ 419.1
Depreciation and amortization	18.2	18.0	36.4	36.3
Segment operating income (loss)	(8.8)	6.1	(29.7)	7.3
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenues	177.6	203.0	347.9	392.0
Depreciation and amortization	16.9	16.7	33.7	33.7
Segment operating income (loss)	29.9	28.4	47.4	56.0
Other [Member]
Segment Reporting Information [Line Items]
Revenues	17.5	13.8	33.5	27.1
Depreciation and amortization	1.3	1.3	2.7	2.6
Segment operating income (loss)	$ (38.7)	$ (22.3)	$ (77.1)	$ (48.7)

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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-Publisher FASB
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