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Goodwill - Summary of Goodwill (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Gross cost, beginning balance $ 598.3
Accumulated impairment losses, beginning balance (236.5)
Net book amount, beginning balance 361.8
Exchange effect 2.3
Gross cost, ending balance 600.6
Accumulated impairment losses, ending balance (236.5)
Net book amount, ending balance $ 364.1