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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								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 200.9	$ 191.1	$ 192.7	$ 187.9	$ 199.6	$ 194.7	$ 196.7	$ 178.9	$ 772.6	$ 769.9	$ 740.5	$ 722.5
Depreciation and amortization									54.4	48.3	26.8
Operating income (loss)	$ 15.9	$ 14.6	$ 3.1	$ 85.1	$ 18.9	$ 5.5	$ 17.2	$ 7.1	118.7	48.7	153.4	$ 133.6
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenues									719.3	720.6	692.4
Depreciation and amortization									49.2	42.8	21.6
Operating income (loss)									139.4	129.4	225.9
Other [Member]
Segment Reporting Information [Line Items]
Revenues									53.3	49.3	48.1
Depreciation and amortization									5.2	5.5	5.2
Operating income (loss)									$ (20.7)	$ (80.7)	$ (72.5)

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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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