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Changes in Significant Accounting Policies - Summary of Net of tax, of Transition to IFRS 15 (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Changes In Sigificant Accounting Policies [line items] |  |  |  |
Revenue |  | $ (2,577.8) | $ (2,761.8) | $ (2,666.4)
Cost of sales |  | $ 2,043.0 | $ 2,105.1 | $ 2,001.2
Impact of adopting IFRS 15 [member] |  |  |  |
Disclosure Of Changes In Sigificant Accounting Policies [line items] |  |  |  |
Revenue | $ (15.0) |  |  |
Cost of sales | 11.5 |  |  |
Impact at 1 January 2018 | $ (3.5) |  |  |

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