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Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Mar. 22, 2018
Business Acquisition [Line Items]      
Goodwill $ 8,103.2 $ 2,396.5  
Annax      
Business Acquisition [Line Items]      
Current assets     $ 32.8
Property, plant & equipment     0.7
Goodwill     38.5
Other intangible assets     11.7
Total assets acquired     83.7
Total liabilities assumed     (55.1)
Net assets acquired     $ 28.6