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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2025
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Numerator and Denominator | A reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings (loss) per common share is as follows (in millions, except share and per share amounts):
|  | Fiscal Year Ended December 31, 2025 |  | Fiscal Year Ended December 31, 2024 |  | Fiscal Year Ended December 31, 2023
Net earnings (loss) attributable to Mirion Technologies, Inc. shareholders |  | $ | 28.8 |  |  | $ | (36.1) |  |  | $ | (96.9) |
Weighted average common shares outstanding – basic |  | 229.959 |  |  | 204.991 |  |  | 196.369 |
Effect of potentially dilutive securities – stock-based awards |  | 0.874 |  |  | — |  |  | — |
Effect of potentially dilutive securities – convertible debt |  | 30.321 |  |  | — |  |  | — |
Weight average common shares outstanding – diluted |  | 261.154 |  |  | 204.991 |  |  | 196.369 |
Net earnings (loss) per common share attributable to Mirion Technologies, Inc. — basic |  | $ | 0.13 |  |  | $ | (0.18) |  |  | $ | (0.49) |
Net earnings (loss) per common share attributable to Mirion Technologies, Inc. — diluted |  | $ | 0.11 |  |  | $ | (0.18) |  |  | $ | (0.49) |
Anti-dilutive employee stock-based awards, excluded |  | 0.080 |  |  | 2.771 |  |  | 0.639 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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