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Schedule I - Condensed Financial Information of the Registrant - CONDENSED BALANCE SHEET (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Oct. 20, 2021 | Oct. 19, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |
Other assets | $ 24.7 |  |  | $ 16.2 | $ 7.5 |  |
Total Assets | 3,118.0 |  |  | 1,547.2 | 1,243.8 |  |
Liabilities and Stockholders’ Equity: |  |  |  |  |  |  |
Deferred income taxes and other liabilities | 197.4 |  |  | 77.5 | 63.5 |  |
Total liabilities | 1,334.0 |  |  | 2,386.7 | 1,960.3 |  |
Additional paid-in capital | 1,845.5 |  |  | 9.5 | 9.5 |  |
Accumulated deficit | (131.6) |  |  | (888.0) | (729.7) |  |
Accumulated Other Comprehensive Loss | (20.7) |  |  | 39.2 | 4.1 |  |
Mirion Technologies, Inc. (Successor) stockholders’ equity | 1,693.2 |  |  | (841.6) | (718.7) |  |
Noncontrolling interests | 90.8 |  |  | 2.1 | 2.2 |  |
Total Stockholders’ Equity | 1,784.0 | $ (109.4) | $ (944.1) | (839.5) | (716.5) | $ (587.7) | $ (448.8)
Total liabilities and stockholders’ equity (deficit) | 3,118.0 |  |  | 1,547.2 | 1,243.8 |  |
Parent Company | MIRION TECHNOLOGIES LTD |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Other assets |  |  |  | 0.3 | 0.1 |  |
Investments in Sub | 1,851.1 |  |  | 839.8 | 716.5 |  |
Total Assets | 1,851.1 |  |  | 0.3 | 0.1 |  |
Liabilities and Stockholders’ Equity: |  |  |  |  |  |  |
Warrant liabilities | 68.1 |  |  |  |  |  |
Deferred income taxes and other liabilities | (1.0) |  |  | 0.1 | 0.1 |  |
Total liabilities | 67.1 |  |  | 839.9 | 716.6 |  |
Additional paid-in capital | 1,845.5 |  |  |  |  |  |
Accumulated deficit | (131.6) |  |  |  |  |  |
Accumulated Other Comprehensive Loss | (20.7) |  |  |  |  |  |
Mirion Technologies, Inc. (Successor) stockholders’ equity | 1,693.2 |  |  | (839.6) | (716.5) |  |
Noncontrolling interests | 90.8 |  |  |  |  |  |
Total Stockholders’ Equity | 1,784.0 |  |  |  |  |  |
Total liabilities and stockholders’ equity (deficit) | $ 1,851.1 |  |  | $ 0.3 | $ 0.1 |  |

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