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

Business Combinations and Acquisitions - Schedule of Business Acquisition, Pro Forma Information (Details)

v3.22.0.1
Business Combinations and Acquisitions - Schedule of Business Acquisition, Pro Forma Information (Details) - USD ($)
$ in Millions
2 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2021
Oct. 19, 2021
Jun. 30, 2021
Jun. 30, 2020
Mirion TopCo        
Business Combination, Separately Recognized Transactions [Line Items]        
Total revenues $ 154.1 $ 168.0 $ 611.6  
Net loss (5.2) (56.3) (192.1)  
Net loss attributable to Mirion TopCo stockholders $ (3.6) $ (54.0) (184.2)  
Biodex and SNC        
Business Combination, Separately Recognized Transactions [Line Items]        
Total revenues     670.9 $ 598.7
Net loss     (142.9) (239.2)
Net loss attributable to Mirion TopCo stockholders     $ (127.9) $ (158.3)