Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 860.8	$ 800.9	$ 717.8
Less:
Adjusted cost of revenues	409.1	396.9	352.5
Segment loss from operations	101.2	59.0	(202.0)
Other loss	(76.4)	(80.9)	(95.8)
(Loss) income from operations	24.8	(21.9)	(297.8)
Less other expense (income):
Third-party interest income	(6.6)	(4.8)	(0.6)
Loss on debt extinguishment	0.0	2.6	0.0
Foreign currency loss (gain), net	2.2	(0.3)	4.9
Increase (decrease) in fair values of warrant liabilities	5.3	24.8	(37.6)
Other income, net	(0.1)	(0.8)	(0.4)
Loss before income taxes	(33.9)	(105.3)	(306.6)
Nonrelated Party
Less other expense (income):
Third-party interest expense	57.9	61.9	42.5
Operating Segments
Less:
Other segment items	350.5	345.0	567.3
Medical
Segment Reporting Information [Line Items]
Revenues	299.7	284.5	271.7
Less:
Adjusted cost of revenues	108.7	107.3	109.7
Segment loss from operations	22.3	13.0	(98.9)
Medical | Operating Segments
Less:
Other segment items	168.7	164.2	260.9
Nuclear & Safety
Segment Reporting Information [Line Items]
Revenues	561.1	516.4	446.1
Less:
Adjusted cost of revenues	300.4	289.6	242.8
Segment loss from operations	78.9	46.0	(103.1)
Nuclear & Safety | Operating Segments
Less:
Other segment items	$ 181.8	$ 180.8	$ 306.4