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Loss Per Share (Tables) | 12 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Summary of calculation of basic and diluted loss per common share | A reconciliation of the numerator and denominator used in the calculation of basic and diluted loss per common share is as follows:
|  | Year Ended June 30, |
In millions, except per share amounts |  | 2021 |  |  | 2020 |  |  | 2019 |
Net loss attributable to Mirion Technologies (TopCo), Ltd. stockholders |  | $ | (158.3 | ) |  | $ | (119.1 | ) |  | $ | (122.0 | )
Weighted average common shares outstanding – basic and diluted |  |  | 6.549 |  |  |  | 6.453 |  |  |  | 6.300 |
Loss per share attributable to Mirion Technologies (TopCo), Ltd. stockholders – basic and diluted |  | $ | (24.18 | ) |  |  | $ (18.45) |  |  |  | $ (19.36) |
Anti-dilutive employee share-based awards, excluded |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 0.5 |

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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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