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Stock-Based Compensation - Schedule of Weighted Average Assumptions (Details) - Unvested performance stock units	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)	3 years	3 years
Risk-free interest rate	4.26%	4.05%
Expected volatility of Magnite	78.00%	87.00%
Expected volatility of selected peer companies	56.00%	55.00%
Expected correlation coefficients of Magnite	57.00%	59.00%
Expected correlation coefficients of selected peer companies	47.00%	47.00%
Dividend yield	0.00%	0.00%

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Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficients

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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