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Revenue from Contract with Customers - Summary of Other Assets Related to Obtain Contracts (Detail) - Other assets [member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Beginning Balance $ 7.6 $ 6.5 $ 9.3
Additions 3.7 (3.1) 8.6
Disposals (2.2) 4.2 (11.4)
Ending Balance 9.0 7.6 6.5
Sales Commission [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Additions 1.5 (10.2) 5.9
Disposals (0.9) 10.2 (5.9)
Ending Balance 0.6    
Bank Guarantees [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Beginning Balance 7.6 6.5 9.3
Additions 1.4 1.5 2.6
Disposals (0.5) (0.4) (5.4)
Ending Balance 8.4 7.6 6.5
Off Set Costs [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Additions 0.8 5.6 0.1
Disposals $ (0.8) $ (5.6) $ (0.1)