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Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Aug. 31, 2016
Mar. 31, 2017
Mar. 31, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
Goodwill       $ 320.2 $ 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)        
Total cash consideration transferred   $ 216.1