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Loss Per Share | 12 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Loss Per Share | 16. Loss Per 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 |
Potentially dilutive unvested stock awards using the treasury stock method or the if-converted method, as applicable, are included when calculating diluted net income earnings (loss) per share attributable to Mirion Technologies (TopCo), Ltd. when their effect is dilutive. Because the Company incurred a net loss for the fiscal years ending June 30, 2021, June 30, 2020, and June 30, 2019, respectively, none of the potentially dilutive common shares were included in the diluted share calculations for those periods as they would have been anti-dilutive.

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