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Summary of significant accounting policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
reporting_unit
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Significant Accounting Policies      
Depreciation expense $ 86,400,000 $ 68,200,000 $ 72,600,000
Reporting units (units) | reporting_unit 3    
Goodwill and intangible impairments $ 0 0 0
Advertising expense $ 29,400,000 $ 45,700,000 $ 41,900,000
Minimum | Digital      
Significant Accounting Policies      
Customer subscription term 1 month    
Minimum | Print and commercial      
Significant Accounting Policies      
Customer subscription term 1 month    
Minimum | Customer Subscription | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01      
Significant Accounting Policies      
Expected timing of satisfaction 1 month    
Maximum | Digital      
Significant Accounting Policies      
Customer subscription term 12 months    
Maximum | Print and commercial      
Significant Accounting Policies      
Customer subscription term 12 months    
Maximum | Customer Subscription | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01      
Significant Accounting Policies      
Expected timing of satisfaction 12 months