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Segment and Related Information - Schedule Of Comparison Of Balance Sheet Assets By Operating Segment (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property $ 37.0 $ 57.3
Total assets 1,404.6 1,562.7
Diagnostics [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 23.9 25.7
Total assets 1,002.8 1,215.6
Other [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 13.1 31.6
Total assets 147.0 155.3
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 1,149.8 $ 1,370.9