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Equity - Additional Information (Detail) $ / shares in Units, € in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 29, 2019 USD ($) | May 22, 2017 USD ($) | May 23, 2016 USD ($) | Oct. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2018 EUR (€) shares | May 08, 2017 £ / shares shares | Feb. 28, 2017 USD ($) | May 09, 2016 £ / shares shares | Feb. 23, 2016 USD ($)
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |  |  |  |
Authorised share capital | shares |  |  |  |  | 0 |  |  | 0 |  |  |  |
Total return of funds announced to shareholders |  |  |  | $ 500.0 |  |  |  |  |  | $ 400.0 |  | $ 1,500.0
Share consolidation basis - number of new ordinary shares | shares |  |  |  |  |  |  |  |  | 45 |  | 5 |
Share consolidation basis - nominal value per share of new ordinary shares | £ / shares |  |  |  |  |  |  |  |  | £ 0.19810 |  | £ 0.18967 |
Share consolidation basis - number of existing ordinary shares | shares |  |  |  |  |  |  |  |  | 47 |  | 6 |
Share consolidation basis - nominal value per share of existing ordinary shares | £ / shares |  |  |  |  |  |  |  |  | £ 0.18967 |  | £ 0.15805 |
Special dividend paid |  | $ 400.0 | $ 1,500.0 | $ 500.0 | $ 0.0 | $ 404.0 | $ 1,500.0 |  |  |  |  |
Dividend per share to shareholders | $ / shares |  |  |  | $ 2.621 |  |  |  |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses |  |  |  |  | 8.0 |  |  |  |  |  |  |
Currency Translation Reserve [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative instruments designated as hedges |  |  |  |  | $ 1.0 | $ 0.0 | $ (3.0) |  |  |  |  |
Treasury shares [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares transferred to employee share trusts | shares |  |  |  |  | 800,000 | 900,000 | 900,000 | 800,000 |  |  |  |
Reduction in number of Treasury Shares due to share consolidation | shares |  |  |  |  |  | 400,000 | 1,700,000 |  |  |  |  |
Number of treasury shares held | shares |  |  |  |  | 6,800,000 | 7,600,000 | 8,900,000 | 6,800,000 |  |  |  |
Treasury shares held, nominal value |  |  |  |  | $ 1.7 | $ 2.0 | $ 2.1 |  |  |  |  |
Cash flow hedging reserve [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassified from OCI to profit or loss - included in financial expenses |  |  |  |  | 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 |  |  |  |  | 1.0 |  |  |  |  |  |  |
Change in fair value of currency swaps recognised in OCI |  |  |  |  | 9.0 |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  |  | € 500 |  |  |  |
Potential ordinary share transactions [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |  |  |  |
Special dividend paid | $ 510.0 |  |  |  |  |  |  |  |  |  |  |
Shares held by employee share trusts [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of shares held |  |  |  |  | $ 3.6 | $ 5.4 | $ 10.5 |  |  |  |  |
Number of shares held | shares |  |  |  |  | 200,000 | 200,000 | 300,000 |  |  |  |  |
Market value of shares held |  |  |  |  | $ 8.3 | $ 12.1 | $ 15.0 |  |  |  |  |

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