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Summary of significant accounting policies - Narrative (Details) | 12 Months Ended
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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 |  |

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