XML 318 R109.htm IDEA: XBRL DOCUMENT v3.24.0.1
Intangible assets - Summary of key assumptions used for each group of cash generating units (Detail)
Dec. 31, 2023
Dec. 31, 2022
Risk    
Disclosure of information for cash-generating units    
Pre-tax discount rate 11.30% 11.20%
Nominal long-term market growth rate 4.00% 4.00%
Scientific, technical & medical    
Disclosure of information for cash-generating units    
Pre-tax discount rate 10.60% 10.50%
Nominal long-term market growth rate 3.00% 3.00%
Legal    
Disclosure of information for cash-generating units    
Pre-tax discount rate 10.90% 10.90%
Nominal long-term market growth rate 4.00% 3.00%
Exhibitions    
Disclosure of information for cash-generating units    
Pre-tax discount rate 12.30% 13.00%
Nominal long-term market growth rate 4.00% 4.00%