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Related Parties - Summary of Remuneration of Key Management Personnel (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Remuneration Of Key Management Personnel [abstract]    
Short-term benefits $ 10.0 $ 10.1
Share based payment 3.3 2.4
Labor contract termination 1.0 1.1
Total $ 14.3 $ 13.6