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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Impact on (loss) 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 | $ (2.9) | $ 7.0 | $ 5.9
Impact on (loss) 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 | (0.3) | 0.2 | 0.3
Impact on (loss) 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 1% increase interest rates | 4.2 | 7.1 | 2.2
Impact on (loss) 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 1% increase interest rates | 3.6 | 5.2 | 12.9
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 | 26.5 | 29.1 | 30.2
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 | 49.6 | 49.7 | 50.6
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 | $ 60.2 | $ 67.4 | $ 68.2

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