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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance $ 1,927.4 $ 1,961.0
Asset acquisition 9.0  
Translation 8.5 (33.6)
Balance $ 1,944.9 $ 1,927.4