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Summary of significant accounting policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) reporting_unit | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Significant Accounting Policies |  |  |
Depreciation expense | $ 68,200,000 | $ 72,600,000 | $ 86,400,000
Reporting units (units) | reporting_unit | 3 |  |
Goodwill and intangible impairments | $ 0 | 0 | 0
Advertising expense | $ 45,700,000 | $ 41,900,000 | $ 56,800,000
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]: 2025-01-01 |  |  |
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]: 2025-01-01 |  |  |
Significant Accounting Policies |  |  |
Expected timing of satisfaction | 12 months |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483385/720-35-55-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483406/720-35-50-1 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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