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Employee Share Plans - Additional Information (Detail)
shares in Millions
3 Months Ended
Mar. 31, 2020
shares
Performance Shares [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based compensation arrangement by share-based payment award, remaining contractual terms 3 years
Performance share units, vesting period 3 years
Achievement of an earnings per share target 70.00%
Achievement of total growth in revenue 30.00%
Performance Shares [Member] | Maximum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Percentage of initial grant 200.00%
2019 Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share available for future grant 3.1
Stock awards expiry 2029