Restructuring Costs - Narrative (Details) $ in Millions			3 Months Ended	12 Months Ended
	Mar. 22, 2022 USD ($)	Mar. 09, 2021 USD ($)	Dec. 31, 2022 USD ($) employee	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated, percentage			12.00%
Number of positions eliminated | employee			172
Restructuring costs			$ 9.7	$ 15.0
Restructuring and related cost, expected cost remaining			$ 8.5	8.5
Restructuring cost		$ 3.6
BuzzFeed News
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3.5
C Acquisition
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.8
Cost of revenue, excluding depreciation and amortization
Restructuring Cost and Reserve [Line Items]
Restructuring costs				8.3
Restructuring cost		3.2
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs				1.2
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Restructuring costs				3.2
Restructuring cost		0.3
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs				$ 2.3
Restructuring cost		$ 0.1