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Financial risk management and derivative financial instruments - Summary of Interest and Foreign Exchange Risk Sensitivities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Impact on profit before tax [member] | Currency risk [member] | Sterling US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | $ 4.0 | $ 4.1 | $ 4.0
Sensitivity to changes in exchange and interest rates | 4.0 | 4.1 | 4.0
Impact on profit before tax [member] | Currency risk [member] | Euro US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | (2.6) | (2.4) | (2.1)
Sensitivity to changes in exchange and interest rates | (2.6) | (2.4) | (2.1)
Impact on profit before tax [member] | Interest rate risk [member] | US dollar interest rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | (1.6) | (0.9) | (2.9)
Sensitivity to changes in exchange and interest rates | (1.6) | (0.9) | (2.9)
Impact on profit before tax [member] | Interest rate risk [member] | Sterling interest rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | 0.6 | 5.5 | 0.3
Sensitivity to changes in exchange and interest rates | 0.6 | 5.5 | 0.3
Impact on net liabilities [member] | Currency risk [member] | Sterling US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | 39.9 | 25.9 | 44.1
Sensitivity to changes in exchange and interest rates | 39.9 | 25.9 | 44.1
Impact on net liabilities [member] | Currency risk [member] | Euro US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | 24.1 | 23.8 | (4.1)
Sensitivity to changes in exchange and interest rates | 24.1 | 23.8 | $ (4.1)
Impact on net liabilities [member] | Currency risk [member] | Sterling: Euro exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | 33.0 | 31.9 |
Sensitivity to changes in exchange and interest rates | $ 33.0 | $ 31.9 |

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