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Summary of significant accounting policies - Narrative (Details)	12 Months Ended
	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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Customer Subscription Term

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Significant Accounting Policies [Line Items]

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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
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-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483406/720-35-50-1

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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.

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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
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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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.

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-Topic 606
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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