Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings 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
	Fiscal Year Ended December 31, 2023		Fiscal Year Ended December 31, 2022		From October 20, 2021 through December 31, 2021		From July 1, 2021 through October 19, 2021		Fiscal Year Ended June 30, 2021
Net loss attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) shareholders	$	(96.9)	$	(276.9)	$	(22.2)	$	(105.7)	$	(158.3)
Weighted average common shares outstanding – basic and diluted	196.369		181.149		180.773		6.685		6.549
Net loss per common share attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) — basic and diluted	$	(0.49)	$	(1.53)	$	(0.12)	$	(15.81)	$	(24.18)
Anti-dilutive employee share-based awards, excluded	0.639		0.956		0.003		0.200		0.300