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Segment and Related Information - Summary of Assets by Geographical Region (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
United States [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 35.4 36.0
Total assets 1,097.2 1,265.8
Rest of World [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 1.6 21.3
Total assets 52.6 105.1
Reportable Geographical Components [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 1,149.8 $ 1,370.9