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Equity - Additional Information (Detail) $ in Millions |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 22, 2017 USD ($) | May 23, 2016 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | May 09, 2017 £ / shares shares | Feb. 28, 2017 USD ($) | May 09, 2016 £ / shares shares | Feb. 23, 2016 USD ($)
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Authorised share capital |  |  | 0 |  |  |  |  |  |
Total return of funds announced to shareholders | $ |  |  |  |  |  |  | $ 400.0 |  | $ 1,500.0
Share consolidation basis - number of new ordinary 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 |  |  |  |  |  | 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 | $ 404.0 | $ 1,500.0 |  |  |  |  |
Currency Translation Reserve [Member] |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Fair value of derivative instruments designated as hedges | $ |  |  | $ 0.0 | $ (3.0) | $ (3.0) |  |  |  |
Treasury shares [member] |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Treasury shares transferred to employee share trusts |  |  | 900,000 | 900,000 |  |  |  |  |
Reduction in number of Treasury Shares due to share consolidation |  |  | 400,000 | 1,700,000 |  |  |  |  |
Number of treasury shares held |  |  | 7,600,000 | 8,900,000 | 11,500,000 |  |  |  |
Treasury shares held, nominal value | $ |  |  | $ 2.0 | $ 2.1 | $ 2.7 |  |  |  |
Shares held by employee share trusts [member] |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Carrying value of shares held | $ |  |  | $ 5.4 | $ 10.5 | $ 18.3 |  |  |  |
Number of shares held |  |  | 200,000 | 300,000 | 500,000 |  |  |  |
Market value of shares held | $ |  |  | $ 12.1 | $ 15.0 | $ 19.8 |  |  |  |

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