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Related Party Transactions - Schedule of Related Party Transactions Activities (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of key management personnel compensation [abstract]      
Short-term employee benefits $ 11.0 $ 11.4 $ 10.7
Severance 0.2 1.6 0.0
Pension scheme contribution 0.5 0.5 0.7
Share-based payments 3.7 1.4 2.3
Long-term incentive plan 1.0 1.1 1.1
Key management remuneration $ 16.4 $ 16.0 $ 14.8