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Other Balance Sheet Information - Additional Detail (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Minority Interest [Line Items]    
Purchase price hedge gain $ 69.9 $ 111.1
Gain on dilution of Stock in Subsidiary   59.7
BvD [Member] | FX Options on Acquisition-Related purchase Price Hedge [Member]    
Minority Interest [Line Items]    
Purchase price hedge gain   111.1
CCXI [Member]    
Minority Interest [Line Items]    
Gain on dilution of Stock in Subsidiary   $ 59.7
Ownership percentage by parent 30.00% 30.00%
Hypothetical percentage sold at fair value 19.00% 19.00%
CCXI [Member] | Business Acquisition Year (2006) [Member]    
Minority Interest [Line Items]    
Ownership percentage by parent 49.00% 49.00%