Post-effective amendment to a registration statement that is not immediately effective upon filing

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

v3.22.0.1
Business Combinations and Acquisitions - Summary of Consideration Transferred by GSAH (Details) - USD ($)
$ in Millions
Oct. 20, 2021
Dec. 31, 2021
Business Combination, Separately Recognized Transactions [Line Items]    
Ending balance, cash consideration paid by GSAH $ 1,300.0  
Class A Common Stock    
Business Combination, Separately Recognized Transactions [Line Items]    
Common stock, shares issued (in shares) 30,401,902 199,523,292
Class B Common Stock    
Business Combination, Separately Recognized Transactions [Line Items]    
Common stock, shares issued (in shares) 8,560,540 8,560,540
GSAH    
Business Combination, Separately Recognized Transactions [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  
Ending balance, cash consideration paid by GSAH 2,225.3  
Shares issued to the Mirion TopCo sellers at fair value 407.0  
Total consideration transferred $ 2,632.3