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Long-term Incentive Plan - Summary of Long-term Incentive Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of long-term incentive plan [abstract]    
Opening balance [1] $ 23.6 $ 12.6
Charge to income statement - continuing operations 5.0 10.5 [1]
Charge to income statement - discontinued operations 0.1 0.5 [1]
Payments (11.5) 0.0 [1]
Translation adjustment 0.9 0.0 [1]
Balance at end of the year 18.1 23.6 [1]
Current portion of long-term incentive plan (18.1) 0.0 [1]
Non-current portion of long-term incentive plan $ 0.0 $ 23.6 [1]
[1] As Restated - Refer note 40 for further details.