Business Segments (Details3) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 4,445.6	$ 4,285.2	$ 4,034.9
Deferred taxes	158.0	175.9
Cash and cash equivalents	584.0	687.7
Corporate, Non-Segment [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Deferred taxes	4.7	6.3	5.1
Cash and cash equivalents	710.5	740.1	771.2
High Performance Materials & Components
Segment Reporting Asset Reconciling Item [Line Items]
Assets	1,749.3	1,624.8	1,594.6
Advanced Alloys & Solutions [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 1,981.1	$ 1,914.0	$ 1,664.0