Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022		From October 20, 2021 through December 31, 2021		From July 1, 2021 through October 19, 2021		Fiscal Year Ended June 30, 2021		Fiscal Year Ended June 30, 2020
Net loss attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) shareholders	$	(276.9)	$	(22.2)	$	(105.7)	$	(158.3)	$	(119.1)
Weighted average common shares outstanding – basic and diluted	181.149		180.773		6.685		6.549		6.453
Net loss per common share attributable to Mirion Technologies, Inc. (Successor) / Mirion Technologies (TopCo), Ltd. (Predecessor) — basic and diluted	$	(1.53)	$	(0.12)	$	(15.81)	$	(24.18)	$	(18.45)
Anti-dilutive employee share-based awards, excluded	0.956		0.003		0.200		0.300		0.400