Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Feb. 22, 2022
Jun. 30, 2021
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39352    
Entity Registrant Name Mirion Technologies, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-0974996    
Entity Address, Address Line One 1218 Menlo Drive    
Entity Address, City or Town Atlanta    
Entity Address, State or Province GA    
Entity Address, Postal Zip Code 30318    
City Area Code 770    
Local Phone Number 432-2744    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 780
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Entity Central Index Key 0001809987    
Class A Common Stock      
Entity Information [Line Items]      
Title of 12(b) Security Class A Common Stock, $0.0001 par value per share    
Trading Symbol MIR    
Security Exchange Name NYSE    
Entity Common Stock, Shares Outstanding   199,523,292  
Entity Information [Line Items]      
Title of 12(b) Security Redeemable warrants, each exercisable for one share of Class A common stock at an exercise price of $11.50    
Trading Symbol MIR WS    
Security Exchange Name NYSE    
Class B Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   8,560,540