Goodwill and Intangible Assets - Narrative (Details) $ in Millions					3 Months Ended	12 Months Ended
	Oct. 01, 2024 reporting_unit	Oct. 01, 2023 reporting_unit	Oct. 01, 2022 reporting_unit	Sep. 30, 2022 reporting_unit	Jun. 30, 2022 USD ($) customer	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) reporting_unit
Goodwill [Line Items]
Number of reporting units | reporting_unit	5	5	5	6				6
Reporting unit, percentage of fair value in excess of carrying amount		20.00%
Goodwill impairment					$ 55.2	$ 0.0	$ 0.0	$ 211.8
Number of reporting units pre-reorganization with excess fair value | reporting_unit								4
Number of reporting units pre-reorganization with less fair value | reporting_unit								2
Nuclear & Safety
Goodwill [Line Items]
Goodwill impairment								$ 69.3
Medical
Goodwill [Line Items]
Goodwill impairment								$ 87.3
Maximum
Goodwill [Line Items]
Reporting unit, percentage of discount rate	13.00%	14.00%
Minimum
Goodwill [Line Items]
Reporting unit, percentage of discount rate	10.00%	12.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Goodwill [Line Items]
Revenue from remaining performance obligation (as a percent)						54.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period						1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Goodwill [Line Items]
Revenue from remaining performance obligation (as a percent)						19.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period						1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Goodwill [Line Items]
Revenue from remaining performance obligation (as a percent)						8.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period						1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Goodwill [Line Items]
Revenue from remaining performance obligation (as a percent)						19.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period						1 year
Radiation Monitoring Systems
Goodwill [Line Items]
Reporting unit, percentage of terminal future cash flows growth rate	3.50%	3.50%
Number of customer termination of contract | customer					1
Revenue, remaining performance obligation, amount					$ 67.0
Radiation Monitoring Systems | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Goodwill [Line Items]
Revenue from remaining performance obligation (as a percent)					80.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period					5 years