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Common Stock - Narrative (Details) | Dec. 31, 2024 vote $ / shares shares | Dec. 31, 2023 $ / shares shares | Dec. 31, 2022 shares
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Class of Stock [Line Items] |  |  |
Preferred stock authorized (in shares) | 10,000,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |
Preferred stock outstanding (in shares) | 0 | 0 | 0
Preferred stock, issued (in shares) | 0 | 0 | 0
UL Solutions | UL Standards & Engagement Liabrary Access |  |  |
Class of Stock [Line Items] |  |  |
Ownership percentage | 69.00% |  |
Voting power | 95.70% |  |
Class A |  |  |
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 1,000,000,000 | 200,000,000 |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |
Votes per share | vote | 1 |  |
Class B |  |  |
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 500,000,000 | 200,000,000 |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |
Votes per share | vote | 10 |  |

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