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Restructuring Costs - Narrative (Details) - USD ($) $ in Millions		1 Months Ended			4 Months Ended	12 Months Ended
	Feb. 21, 2024	Apr. 30, 2023	Dec. 31, 2022	Mar. 31, 2021	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
2023 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated, percentage		15.00%
Restructuring charges						$ 6.8
2022 Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated, percentage			12.00%
Restructuring costs			$ 5.3
BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 4.9
Restructuring costs							$ 10.2
HuffPost
Restructuring Cost and Reserve [Line Items]
Restructuring cost				$ 3.6
2024 Workforce Reduction \| Subsequent Event
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated, percentage	16.00%
Cost of revenue, excluding depreciation and amortization \| 2023 Workforce Reduction \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges						4.3
Cost of revenue, excluding depreciation and amortization \| BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring costs							5.7
Cost of revenue, excluding depreciation and amortization \| HuffPost
Restructuring Cost and Reserve [Line Items]
Restructuring cost				3.2
Sales and marketing \| 2023 Workforce Reduction \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges						1.3
Sales and marketing \| BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring costs							1.6
Sales and marketing \| HuffPost
Restructuring Cost and Reserve [Line Items]
Restructuring cost				0.3
General and administrative \| 2023 Workforce Reduction \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges						0.4
General and administrative \| BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0.9
Research and development \| 2023 Workforce Reduction \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 0.8
Research and development \| BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring costs							$ 2.0
Research and development \| HuffPost
Restructuring Cost and Reserve [Line Items]
Restructuring cost				$ 0.1