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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Balance $ 1,961.0 $ 1,933.1
Translation (18.4) 27.9
Balance $ 1,942.6 $ 1,961.0