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Share Based Compensation - Summary of FV Per Performance Criteria and Program (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Executive performance plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value Group operating income | $ 92.23 | $ 94.20 | $ 95.70 | $ 111.78
Key contributor plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value |  |  |  | 111.78
Key contributor plan [member] | Fair value – Tranche 1 [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 96.21 | 109.80 | 84.12 |
Key contributor plan [member] | Fair value – Tranche 2 [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 94.20 | 96.21 | 111.78 |
Key contributor plan [member] | Fair value – Tranche 3 [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 92.23 | 94.20 | 95.70 |
Fair Value Absolute T S R | Executive performance plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 60.41 | 67.54 | 67.59 | 111.78
Fair Value Relative T S R | Executive performance plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 29.20 | 28.97 | 12.97 | 111.78
Long-term variable compensation program [member] | Executive team plans [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Share price at grant | 116.66 | 78.88 | 90.70 | 65.79
Fair value Group operating income | 110.70 | 74.22 | 86.94 | 62.93
Long-term variable compensation program [member] | Fair Value Absolute T S R | Executive team plans [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 113.47 | 54.69 | 87.92 | 80.40
Long-term variable compensation program [member] | Fair Value Relative T S R | Executive team plans [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | $ 108.61 | $ 98.06 | $ 94.63 | $ 78.66

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