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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)

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