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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 |  |

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