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Goodwill - Summary of Goodwill (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
Gross cost $ 503.9 $ 503.9
Accumulated impairment losses (236.5) (236.5)
Net book amount $ 267.4 $ 267.4