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Changes in Significant Accounting Policies - Summary of Impact on Consolidated Income Statement and Statement of Other Comprehensive Income and Cash flow Statement (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of initial application of standards or interpretations [line items]      
Revenue $ 2,577.8 $ 2,761.8 $ 2,666.4
Cost of sales (2,043.0) (2,105.1) (2,001.2)
Others (879.6)    
(Loss)/profit for the year (344.8) (7.7) 169.1
Other comprehensive income, net of tax (330.0) 279.2 121.4
Total comprehensive income for the year (674.8) 271.5 290.5
Cash flows from operating activities      
Cash generated by operations 998.0 1,286.5 1,245.4
Change in working capital (16.3) (69.4) (2.3)
Others (423.9)    
Cash flows from operating activities 557.8 $ 762.4 $ 917.5
Adjustment [member]      
Disclosure of initial application of standards or interpretations [line items]      
Revenue (15.0)    
Cost of sales 11.5    
Others 0.0    
(Loss)/profit for the year (3.5)    
Other comprehensive income, net of tax 0.0    
Total comprehensive income for the year (3.5)    
Cash flows from operating activities      
Cash generated by operations (3.5)    
Change in working capital 3.5    
Amounts without adoption of IFRS 15 [member]      
Disclosure of initial application of standards or interpretations [line items]      
Revenue 2,562.8    
Cost of sales (2,031.5)    
Others (879.6)    
(Loss)/profit for the year (348.3)    
Other comprehensive income, net of tax (330.0)    
Total comprehensive income for the year (678.3)    
Cash flows from operating activities      
Cash generated by operations 994.5    
Change in working capital (12.8)    
Others (423.9)    
Cash flows from operating activities $ 557.8