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Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($)
$ in Millions
6 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Business Acquisition [Line Items]          
Goodwill     $ 319.4   $ 316.1
Total cash consideration transferred   $ 216.1      
Assurex [Member]          
Business Acquisition [Line Items]          
Current assets       $ 18.2  
Intangible assets       295.6  
Equipment       1.9  
Goodwill     $ 121.1 121.1 $ 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)     $ (5.5)  
Total cash consideration transferred $ 216.1