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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 384.6	$ 391.9	$ 405.0
Specialty Industrial
Disaggregation of Revenue [Line Items]
Revenue	100.6	107.5	118.4
Transportation
Disaggregation of Revenue [Line Items]
Revenue	107.1	112.5	119.3
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Revenue	176.9	171.9	167.3
Gas Cylinders
Disaggregation of Revenue [Line Items]
Revenue	174.8	186.3	186.4
Gas Cylinders | Specialty Industrial
Disaggregation of Revenue [Line Items]
Revenue	32.0	30.3	32.0
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Revenue	64.1	67.6	70.6
Gas Cylinders | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Revenue	78.7	88.4	83.8
Elektron
Disaggregation of Revenue [Line Items]
Revenue	196.4	176.0	187.1
Elektron | Specialty Industrial
Disaggregation of Revenue [Line Items]
Revenue	55.2	47.6	54.9
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Revenue	43.0	44.9	48.7
Elektron | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Revenue	98.2	83.5	83.5
Graphic Arts
Disaggregation of Revenue [Line Items]
Revenue	13.4	29.6	31.5
Graphic Arts | Specialty Industrial
Disaggregation of Revenue [Line Items]
Revenue	13.4	29.6	31.5
Graphic Arts | Transportation
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0
Graphic Arts | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Revenue	$ 0.0	$ 0.0	$ 0.0

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