Income Taxes - Operating loss carry forwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net operating loss carry forwards
Net operating loss carry forward	$ 6.7	$ 6.6
Valuation allowance	23.8	20.3
Restructuring of manufacturing supply chain operations		(16.1)	$ 29.3
Valuation allowance on foreign tax credits			22.1
Income tax expense (benefit) supply chain restructuring			$ 7.2
Restructuring of manufacturing supply chain operations, Deferred tax asset recognized	$ 16.1
Amortization period	10 years
Foreign
Net operating loss carry forwards
Net operating loss carryforward, not subject to expiration	$ 23.9
Net operating loss carryforward, subject to expiration	9.1
Operating loss carryforward	33.0
Tax credit carryforward	17.4	13.6
Austrian Operations
Net operating loss carry forwards
Operating loss carryforward	23.9
United States Operations
Net operating loss carry forwards
Operating loss carryforward	1.0
Switzerland operations
Net operating loss carry forwards
Operating loss carryforward	9.1
U.S.
Net operating loss carry forwards
Capital loss carry forward	1.6
Domestic
Net operating loss carry forwards
Net operating loss carryforward, not subject to expiration	0.4
Net operating loss carryforward, subject to expiration	0.6
Operating loss carryforward	1.0
Capital loss carry forward	$ 1.6	$ 1.7