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Business Combinations and Acquisitions - Summary of Consideration Transferred by GSAH (Details) - USD ($) $ in Millions |  | 12 Months Ended
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Oct. 20, 2021 | Dec. 31, 2023
GSAH |  |
Business Acquisition [Line Items] |  |
Cash consideration paid by GSAH | $ 1,310.0 |
Cash repayment of existing Mirion TopCo third-party debt | 903.6 |
Reimbursement of Mirion TopCo transaction costs | 11.7 |
Cash consideration paid by GSAH | 2,225.3 |
Shares issued to Mirion TopCo sellers at fair value | 407.0 |
Total consideration transferred | $ 2,632.3 |
GSAH | Class A Common Stock |  |
Business Acquisition [Line Items] |  |
Business acquisition equity interest issued or issuable (in shares) | 30,401,902 |
GSAH | Class B Common Stock |  |
Business Acquisition [Line Items] |  |
Business acquisition equity interest issued or issuable (in shares) | 8,560,540 |
Intermediate Co |  |
Business Acquisition [Line Items] |  |
Cash consideration paid by GSAH | $ 1,300.0 |
Intermediate Co | Class A Common Stock |  |
Business Acquisition [Line Items] |  |
Business acquisition equity interest issued or issuable (in shares) | 30,401,902 |
Intermediate Co | Class B Common Stock |  |
Business Acquisition [Line Items] |  |
Business acquisition equity interest issued or issuable (in shares) | 8,560,540 | 7,787,333

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