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Stockholders' equity - Narrative (Details)
shares in Thousands
 12 Months Ended
Feb. 17, 2026
USD ($)
Dec. 31, 2025
USD ($)
vote
shares
Dec. 31, 2024
USD ($)
shares
Apr. 23, 2025
USD ($)
Apr. 24, 2024
USD ($)
May 01, 2018
vote
Class of Stock [Line Items]            
Vote per share (in votes) | vote           1
Common stock exchangeable shares   1        
Share repurchase program, authorized amount       $ 100,000,000 $ 100,000,000  
Stock repurchased and retired during period   $ 81,700,000 $ 63,200,000      
Class A Common Stock            
Class of Stock [Line Items]            
Common stock shares outstanding (in shares) | shares   24,653 24,668      
Vote per share (in votes) | vote   1        
Stock repurchased and retired during period (in shares) | shares   1,014 1,045      
Remaining authorization under the share repurchase program   $ 18,300,000        
Class A Common Stock | Subsequent Event            
Class of Stock [Line Items]            
Remaining authorization under the share repurchase program $ 198,300,000          
Share repurchase program, increase, amount $ 180,000,000.0          
Class B Common Stock            
Class of Stock [Line Items]            
Common stock shares outstanding (in shares) | shares   11,935 12,620      
Vote per share (in votes) | vote   1