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Equity - Additional Information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Jan. 14, 2019 £ / shares shares | Oct. 31, 2018 USD ($)
Disclosure of reserves within equity [line items] |  |  |  |  |
Authorised share capital | shares | 0 |  |  |  |
Total return of funds announced to shareholders |  |  |  |  | $ 500.0
Share consolidation basis - number of new ordinary shares | shares |  |  |  | 19 |
Share consolidation basis - nominal value per share of new ordinary shares | £ / shares |  |  |  | £ 0.20852 |
Share consolidation basis - number of existing ordinary shares | shares |  |  |  | 20 |
Share consolidation basis - nominal value per share of existing ordinary shares | £ / shares |  |  |  | £ 0.19810 |
Special dividend paid | $ 0.0 | $ 0.0 | $ 510.0 |  |
Reclassified from OCI to profit or loss - included in financial expenses | (96.0) | 13.0 | $ (38.0) |  |
Consolidation of Shares | shares |  |  | 10,000,000 |  |
Treasury shares [member] |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |
Treasury shares transferred to employee share trusts | $ 1.4 | $ 0.6 | $ 0.8 |  |
Number of treasury shares held | shares | 3,700,000 | 5,100,000 | 5,700,000 |  |
Treasury shares held, nominal value | $ 1.0 | $ 1.4 | $ 1.6 |  |
Cash flow hedge reserves [member] |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses | (96.0) | 13.0 | (38.0) |  |
EUR bonds [member] | Cash flow hedge reserves [member] |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses | 15.0 | 9.0 | 8.0 |  |
Change in fair value of currency swaps recognised in OCI | $ (81.0) | $ 22.0 | $ (30.0) |  |

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