Income Taxes - Operating loss carry forwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net operating loss carry forwards
Net operating loss carry forward	$ 6.6	$ 7.5
Valuation allowance	20.2	42.1
increase in valuation allowance	21.9
Restructuring of manufacturing supply chain operations	29.3
Valuation allowance on foreign tax credits	22.1
Income tax expense (benefit) supply chain restructuring	7.2
Foreign
Net operating loss carry forwards
Net operating loss carryforward, not subject to expiration	24.6
Net operating loss carryforward, subject to expiration	0.8
Operating loss carryforward	24.6
Tax credit carryforward	13.8	34.4
Austrian Operations
Net operating loss carry forwards
Operating loss carryforward	24.6
Korean Operations
Net operating loss carry forwards
Operating loss carryforward	2.6
U.S.
Net operating loss carry forwards
Capital loss carry forward	1.7
Domestic
Net operating loss carry forwards
Net operating loss carryforward, subject to expiration	1.8
Operating loss carryforward	2.6
Capital loss carry forward	$ 1.7	$ 1.0