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Segment and Related Information - Summary of Assets by Geographical Region (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property $ 57.3 $ 43.2 [1]
Total assets 1,562.7 1,175.3 [1]
United States [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 36.0 20.0
Total assets 1,265.8 853.4
Rest of World [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 21.3 23.2
Total assets 105.1 110.6
Reportable Geographical Components [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 1,370.9 $ 964.0
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.