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Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2022
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):
SuccessorPredecessor
Three Months Ended March 31, 2022Three Months Ended March 31, 2021
Net loss attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) shareholders$(17.7)$(40.7)
Weighted average common shares outstanding – basic and diluted180.774 6.586 
Net loss per common share attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) — basic and diluted$(0.10)$(6.18)
Anti-dilutive employee share-based awards, excluded0.9880.3