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Business Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Aug. 31, 2017
Business Acquisition [Line Items]          
Goodwill   $ 318.6 $ 316.1 $ 195.3  
Total cash consideration transferred     $ 216.1 $ 37.0  
Assurex [Member]          
Business Acquisition [Line Items]          
Current assets   18.2      
Intangible assets   295.6      
Equipment   1.9      
Goodwill   121.1     $ 119.2
Current liabilities   (18.9)      
Deferred tax liability   (66.3)      
Total fair value purchase price $ 351.6 351.6      
Less: Contingent consideration (130.0) (130.0)      
Less: Cash acquired   (5.5)      
Total cash consideration transferred $ 216.1 $ 216.1