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
	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 183.5	$ 168.8
Depreciation and amortization	6.8	6.0
Segment operating income (loss)	43.3	25.9
Diagnostics
Segment Reporting Information [Line Items]
Revenues	171.9	164.5
Depreciation and amortization	5.5	5.0
Segment operating income (loss)	62.3	45.1
Other
Segment Reporting Information [Line Items]
Revenues	11.6	4.3
Depreciation and amortization	1.3	1.0
Segment operating income (loss)	$ (19.0)	$ (19.2)