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Purchase Price Allocation (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Aug. 10, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Indemnification asset $ 16.3 $ 17.0    
Goodwill $ 3,662.7 $ 3,753.2   $ 1,023.6
Bureau van Dijk (BvD) [Member]        
Business Acquisition [Line Items]        
Current assets     $ 158.4  
Property and equipment, net     4.2  
Total intangible assets     1,352.4  
Goodwill     2,614.7  
Other assets     5.9  
Deferred revenue     (101.1)  
Accounts payable and accrued liabilities     (44.3)  
Deferred tax liabilities, net     (329.8)  
Other liabilities     (118.4)  
Liabilities assumed     (593.6)  
Net assets acquired     3,542.0  
Bureau van Dijk (BvD) [Member] | Trade Names [Member]        
Business Acquisition [Line Items]        
Total intangible assets     82.3  
Bureau van Dijk (BvD) [Member] | Customer Relationships [Member]        
Business Acquisition [Line Items]        
Total intangible assets     998.7  
Bureau van Dijk (BvD) [Member] | Databases [Member]        
Business Acquisition [Line Items]        
Total intangible assets     12.9  
Bureau van Dijk (BvD) [Member] | Product Technology [Member]        
Business Acquisition [Line Items]        
Total intangible assets     $ 258.5