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Goodwill and intangible assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Intangible Assets      
Weighted average useful life 10 years 2 months 12 days    
Amortization expenses $ 88,100,000 $ 90,000,000.0 $ 95,600,000
Future amortization expense - 2025 80,700,000    
Future amortization expense - 2026 62,200,000    
Future amortization expense - 2027 60,900,000    
Future amortization expense - 2028 26,000,000    
Future amortization expense - 2029 and thereafter 33,800,000    
Property, plant and equipment impairments 0    
Goodwill and intangible impairments 0 0 $ 0
Domestic Gannett Media      
Intangible Assets      
Goodwill accumulated impairment losses 340,800,000 340,800,000  
Newsquest      
Intangible Assets      
Goodwill accumulated impairment losses 70,500,000 70,500,000  
Digital Marketing Solutions      
Intangible Assets      
Goodwill accumulated impairment losses $ 44,100,000 $ 44,100,000  
Minimum | Measurement Input, Long-term Revenue Growth Rate      
Intangible Assets      
Intangible assets measurement inputs (percent) 0.00%    
Minimum | Measurement Input, Discount Rate      
Intangible Assets      
Intangible assets measurement inputs (percent) 13.50%    
Maximum | Measurement Input, Long-term Revenue Growth Rate      
Intangible Assets      
Intangible assets measurement inputs (percent) 3.00%    
Maximum | Measurement Input, Discount Rate      
Intangible Assets      
Intangible assets measurement inputs (percent) 20.00%    
Advertiser relationships      
Intangible Assets      
Weighted average useful life 11 years 1 month 6 days    
Other customer relationships      
Intangible Assets      
Weighted average useful life 10 years    
Subscriber relationships      
Intangible Assets      
Weighted average useful life 10 years 3 months 18 days    
Other intangible assets      
Intangible Assets      
Weighted average useful life 3 years 10 months 24 days