v3.26.1
Share based awards - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 25, 2024
May 16, 2019
May 11, 2015
Mar. 31, 2026
Mar. 31, 2025
Employee Stock Option          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Number of shares exercisable (in shares)       517,846  
Weighted average contractual term of options exercisable       3 years 6 months 29 days  
Weighted average exercise price of options exercisable (in USD per share)       $ 178.31  
Restricted stock units 2013          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Additional ordinary shares which have been reserved for issuance (in shares) 2,500,000   2,500,000    
Ordinary shares which have been reserved for issuance (in shares) 6,600,000        
Consultants Restricted Stock Units 2019          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Ordinary shares which have been reserved for issuance (in shares)   250,000      
Consultants Restricted Stock Units 2019 | Outside Director          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Shares vesting period   12 months      
Performance Share Unit (PSUs)          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Fair value of stock units vested       $ 0.0 $ 1.9
Restricted Stock Units (RSUs)          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Fair value of stock units vested       $ 4.3 $ 5.0
PSUs based on service and EPS targets | Maximum          
Compensation Related Costs Share Based Payments Disclosure [Line Items]          
Stock units to be granted (in shares)       47,779