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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, 2020
Mar. 31, 2020
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]                      
Revenues $ 93.2 $ 164.0 $ 195.1 $ 186.3 $ 215.4 $ 216.6 $ 216.8 $ 202.3 $ 638.6 $ 851.1 $ 743.7
Depreciation and amortization                 72.0 73.0 54.4
Segment operating income (loss) $ (68.3) $ (133.7) $ (8.8) $ (20.9) $ (5.6) $ 5.9 $ 6.1 $ 1.2 (231.7) 7.6 121.9
Diagnostics [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 593.5 789.4 690.4
Depreciation and amortization                 68.2 67.7 49.2
Segment operating income (loss)                 (82.4) 133.3 142.6
Other [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 45.1 61.7 53.3
Depreciation and amortization                 3.8 5.3 5.2
Segment operating income (loss)                 $ (149.3) $ (125.7) $ (20.7)
[1] An immaterial prior period goodwill impairment charge of $1.3 million was previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations was reclassified to conform to the current period presentation and is included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.