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Segment and Related Information - Summary of Assets by Geographical Region (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property $ 51.1 $ 58.3
Total assets by geographical region 1,224.4 880.5
United States [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 27.6 33.6
Total assets by geographical region 912.8 532.6
Rest of World [Member]    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 23.5 24.7
Total assets by geographical region 112.4 109.0
Reportable Geographical Components [Member]    
Segment Reporting Information [Line Items]    
Total assets by geographical region $ 1,025.2 $ 641.6