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Restructuring Costs (Details) - USD ($) $ in Millions			1 Months Ended		4 Months Ended	12 Months Ended
	Feb. 06, 2025	Feb. 21, 2024	Apr. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commerce Media Holdings, LLC
Restructuring Cost and Reserve [Line Items]
Reimbursement for restructuring costs		$ 1.8
2025 Workforce Reduction | Subsequent Event
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated (as percent)	5.00%
2024 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated (as percent)		16.00%
Restructuring costs						$ 2.9
2024 Workforce Reduction | Cost of revenue, excluding depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring costs						1.2
2024 Workforce Reduction | Sales and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring costs						1.5
2024 Workforce Reduction | General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs						$ 0.2
2023 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated (as percent)			15.00%
Restructuring costs							$ 6.8
2023 Workforce Reduction | Cost of revenue, excluding depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring costs							4.3
2023 Workforce Reduction | Sales and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring costs							1.3
2023 Workforce Reduction | General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0.4
2023 Workforce Reduction | Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs							$ 0.8
2022 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated (as percent)				12.00%
Restructuring costs				$ 5.3				$ 10.2
2022 Workforce Reduction | Cost of revenue, excluding depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring costs								5.7
2022 Workforce Reduction | Sales and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring costs								1.6
2022 Workforce Reduction | General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0.9
2022 Workforce Reduction | Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs								$ 2.0
BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring costs					$ 4.9

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Restructuring and Related Cost, Reimbursement For Restructuring Costs

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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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