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Goodwill - Summary of Goodwill (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Gross cost, beginning balance $ 611.3
Accumulated impairment losses, beginning balance (236.5)
Net book amount, beginning balance 374.8
Acquisition adjustment (36.7)
Exchange effect 8.7
Gross cost, ending balance 583.3
Accumulated impairment losses, ending balance (236.5)
Net book amount, ending balance $ 346.8