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Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Loss per Share [Abstract] |
Reconciliation of Numerator and Denominator | A reconciliation of the numerator and denominator used in the calculation of basic and diluted loss per common share is as follows (in millions, except per share amounts):
| Successor |  |  | Predecessor
| From October 20, 2021 through December 31, 2021 |  |  | From July 1, 2021 through October 19, 2021 |  | Fiscal Year Ended June 30, 2021 |  | Fiscal Year Ended June 30, 2020 |  | Fiscal Year Ended June 30, 2019
Net loss attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) shareholders | $ | (22.2) |  |  |  | $ | (105.7) |  |  | $ | (158.3) |  |  | $ | (119.1) |  |  | $ | (122.0) |
Weighted average common shares outstanding – basic and diluted | 180.773 |  |  |  | $ | 6.685 |  |  | $ | 6.549 |  |  | $ | 6.453 |  |  | $ | 6.300 |
Net loss per common share attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) — basic and diluted | $ | (0.12) |  |  |  | $ | (15.81) |  |  | $ | (24.18) |  |  | $ | (18.45) |  |  | $ | (19.36) |
Anti-dilutive employee share-based awards, excluded | 0.003 |  |  | 0.200 |  | 0.300 |  | 0.400 |  | 0.500

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- Definition Loss per Share [Abstract] + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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