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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 |  |

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