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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			9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 216.6	$ 183.1	[1]	$ 635.7	$ 549.8	[1]
Depreciation and amortization	18.3	12.9		54.6	39.3	[1]
Segment operating income (loss)	5.9	13.8	[1]	13.2	104.3	[1]
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenues	200.5	169.3		592.5	509.7
Depreciation and amortization	17.0	11.7		50.7	35.4
Segment operating income (loss)	40.6	34.7		96.6	101.8
Other [Member]
Segment Reporting Information [Line Items]
Revenues	16.1	13.8		43.2	40.1
Depreciation and amortization	1.3	1.2		3.9	3.9
Segment operating income (loss)	$ (34.7)	$ (20.9)		$ (83.4)	$ 2.5
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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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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