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Equity - Summary of Shares Held By Employee Share Trusts (Detail) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of classes of share capital [abstract] |  |  |
Number of shares | 0.9 | 0.1 | 0.1
Carrying value | $ 21.7 | $ 1.4 | $ 4.9
Market value | $ 57.3 | $ 3.1 | $ 9.6

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- Definition Number of shares held by employee share trust. + References No definition available. + Details
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- Definition Shares held in employee trust , carrying value. + References No definition available. + Details
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- Definition Shares held in employee trust , market value. + References No definition available. + Details
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