Annual report pursuant to Section 13 and 15(d)

Business Combinations and Acquisitions - Summary of Consideration Transferred by GSAH (Details)

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Business Combinations and Acquisitions - Summary of Consideration Transferred by GSAH (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 20, 2021
Dec. 31, 2022
Business Acquisition [Line Items]    
Cash consideration paid by GSAH $ 1,300.0  
GSAH    
Business Acquisition [Line Items]    
Beginning balance, 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 8,040,540