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Equity - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2020 EUR (€) shares | Dec. 31, 2019 EUR (€) shares | Jan. 14, 2019 £ / shares shares | Oct. 31, 2018 USD ($)
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Authorised share capital | shares | 0 |  |  | 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 |  | $ 510.0 |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses | $ 13.0 | (38.0) | $ 8.0 |  |  |  |
Fair value of derivative instruments designated as hedges | 7.0 | $ 30.0 |  |  |  |  |
Consolidation of Shares | shares |  | 10,000,000 |  |  |  |  |
Currency Translation Reserve [Member] |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Fair value of derivative instruments designated as hedges |  | $ 1.0 | $ 1.0 |  |  |  |
Treasury shares [member] |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Treasury shares transferred to employee share trusts | shares | 600,000 | 800,000 | 800,000 | 600,000 | 800,000 |  |
Reduction in number of Treasury Shares due to share consolidation | shares |  | 300,000 |  |  |  |  |
Number of treasury shares held | shares | 5,100,000 | 5,700,000 | 6,800,000 | 5,100,000 | 5,700,000 |  |
Treasury shares held, nominal value | $ 1.4 | $ 1.6 | $ 1.7 |  |  |  |
Cash flow hedging reserve [member] |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses | 13.0 | (38.0) | 8.0 |  |  |  |
EUR500m 2.125% bonds [member] | Cash flow hedging reserve [member] |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses | 9.0 | 8.0 |  |  |  |  |
Change in fair value of currency swaps recognised in OCI | 22.0 | (30.0) |  |  |  |  |
Notional amount | € |  |  |  | € 500 | € 500 |  |
EUR500m 1.625% bonds [member] | Cash flow hedging reserve [member] |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Notional amount | € |  |  |  | € 500 |  |  |
Shares held by employee share trusts [member] |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Carrying value of shares held | $ 1.4 | $ 4.9 | $ 3.6 |  |  |  |
Number of shares held | shares | 50,000 | 100,000 | 200,000 |  |  |  |
Market value of shares held | $ 3.1 | $ 9.6 | $ 8.3 |  |  |  |

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