Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table shows changes in the carrying amount of goodwill by reportable segment as of December 31, 2022 and December 31, 2021 (in millions):

Predecessor
	Medical		Industrial		Consolidated
Balance—June 30, 2020	$	106.8	$	415.8	$	522.6
Acquisition of Sun Nuclear	130.2		—		130.2
Acquisition of Biodex	11.1		—		11.1
Acquisition of Dosimetrics	1.6		—		1.6
Translation adjustment	(0.2)		16.2		16.0
Balance—June 30, 2021	$	249.5	$	432.0	$	681.5
Acquisition of Dosimetry Badge	0.9		—		0.9
Translation adjustment	(0.4)		(4.6)		(5.0)
Balance—October 19, 2021	$	250.0	$	427.4	$	677.4

Successor
	Medical		Industrial		Consolidated
Balance—October 20, 2021	$	—	$	—	$	—
Business Combination (acquisition of Mirion)	675.2		963.8		1639.0
Acquisition of CHP Badge	1.5		—		1.5
Acquisition of Safeline	0.8		—		0.8
Acquisition of CIRS	35.0		—		35.0
Translation adjustment	—		(13.7)		(13.7)
Balance—December 31, 2021	$	712.5	$	950.1	$	1,662.6
Business Combination and other acquisitions - measurement period adjustments	(1.9)		5.3		3.4
CI acquisition			4.9		4.9
Goodwill impairment	(87.3)		(124.5)		(211.8)
Goodwill reclassified as assets held for sale	(7.3)		—		(7.3)
Translation adjustment	—		(33.8)		(33.8)
Balance—December 31, 2022	$	616.0	$	802.0	$	1,418.0

Gross carrying amounts and cumulative goodwill impairment losses are as follows (in millions):

	December 31, 2022
	Gross Carrying Amount	Cumulative Impairment
Goodwill	1,629.8	(211.8)

Schedule of Finite-Lived Intangible Assets

A summary of intangible assets useful lives, gross carrying value and related accumulated amortization is below (in millions):

Successor
		December 31, 2022
	Original Average  Life in Years	Gross Carrying  Amount		Accumulated  Amortization		Net Book  Value
Customer relationships	6 - 13	$	336.8	$	(83.1)	$	253.7
Distributor relationships	7 - 13	60.9		(8.7)		52.2
Developed technology	5 - 16	248.9		(36.3)		212.6
Trade names	3 - 10	98.2		(12.0)		86.2
Backlog and other	1 - 4	74.8		(29.1)		45.7
Total		$	819.6	$	(169.2)	$	650.4
		December 31, 2021
	Original Average  Life in Years	Gross Carrying  Amount		Accumulated  Amortization		Net Book  Value
Customer relationships	6 - 13	$	341.0	$	(15.3)	$	325.7
Distributor relationships	7 - 13	61.0		(1.5)		59.5
Developed technology	5 - 16	251.2		(5.9)		245.3
Trade names	3 - 10	100.0		(2.1)		97.9
Backlog and other	1 - 4	85.7		(7.2)		78.4
Total		$	838.9	$	(32.0)	$	806.9
Predecessor
		June 30, 2021
	Original Average  Life in Years	Gross Carrying  Amount		Accumulated  Amortization		Net Book  Value
Customer relationships	6-17	$	420.4	$	(205.6)	$	214.8
Developed technology	3-16	184.5		(104.7)		79.8
Trade names	5-9	47.4		(29.5)		17.9
Backlog and other	1-9	40.6		(26.8)		13.8
Total		$	692.9	$	(366.6)	$	326.3

Schedule of Finite-lived Intangible Assets Amortization Expense

Aggregate amortization expense for intangible assets included in cost of revenues and operating expenses was as follows (in millions):

	Successor				Predecessor
	Fiscal Year Ended December 31, 2022		From October 20, 2021 to December 31, 2021		From July 1, 2021 through October 20, 2021		Fiscal Year Ended June 30, 2021		Fiscal Year Ended June 30, 2020
Amortization expense for intangible assets in:
Cost of revenues	$	26.5	$	5.6	$	6.6	$	20.9	$	17.9
Operating expenses	$	119.3	$	26.4	$	13.1	$	41.9	$	32.7