Annual report pursuant to Section 13 and 15(d)

Loss Per Share - Reconciliation of Numerator and Denominator (Details)

v3.22.4
Loss Per Share - Reconciliation of Numerator and Denominator (Details) - USD ($)
$ / shares in Units, $ in Millions
 2 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2021
Oct. 19, 2021
Dec. 31, 2022
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Net loss attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) shareholders $ (22.2) $ (105.7) $ (276.9) $ (158.3) $ (119.1)
Weighted average common shares outstanding — basic (in shares) 180,773,000 6,685,000 181,149,000 6,549,000 6,453,000
Weighted average common shares outstanding — diluted (in shares) 180,773,000 6,685,000 181,149,000 6,549,000 6,453,000
Net loss per common share attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) stockholders — basic (in dollars per share) $ (0.12) $ (15.81) $ (1.53) $ (24.18) $ (18.45)
Net loss per common share attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) stockholders — diluted (in dollars per share) $ (0.12) $ (15.81) $ (1.53) $ (24.18) $ (18.45)
Anti-dilutive employee share-based awards, excluded 0 0 0 0 0
Share-based awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Anti-dilutive employee share-based awards, excluded 3,000.000 200,000 956,000 300,000 400,000