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Quarterly Financial Data - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Line Items]              
Benefit to net income related to the resolution of legacy tax matters       $ 1.6   $ 1.6 $ 6.4
FX gain relating to the liquidation of a subsidiary       35.0   36.6  
Litigation settlement       863.8   $ 863.8  
Tax Rate Reform, Amount         $ 245.6    
Purchase price hedge gain         111.1    
CCXI gains         59.7    
CCXI [Member]              
Quarterly Financial Data [Line Items]              
CCXI gains     $ 59.7   $ 59.7    
Bureau van Dijk (BvD) [Member] | FX Collars and Forward Contracts [Member]              
Quarterly Financial Data [Line Items]              
Purchase price hedge gain $ 69.9 $ 41.2          
After Tax [Member]              
Quarterly Financial Data [Line Items]              
Litigation settlement       $ 700.7      
After Tax [Member] | Bureau van Dijk (BvD) [Member] | FX Collars and Forward Contracts [Member]              
Quarterly Financial Data [Line Items]              
Purchase price hedge gain $ 44.4 $ 25.3