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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 7.0 | $ 5.9 | $ 4.0
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 | 0.2 | 0.3 | (2.6)
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 5 cent fall in exchange rate | 7.1 | 2.2 | (1.6)
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 5 cent fall in exchange rate | 5.2 | 12.9 | 0.6
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 | 29.1 | 30.2 | 39.9
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 | 49.7 | 50.6 | 24.1
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 | $ 67.4 | $ 68.2 | $ 33.0

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