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Business Segments (Details3) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 4,285.2	$ 4,034.9	$ 5,634.6
Deferred taxes	175.9	208.5
Cash and cash equivalents	687.7	645.9
Corporate, Non-Segment [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Deferred taxes	6.3	5.1	64.5
Cash and cash equivalents	740.1	771.2	658.1
High Performance Materials & Components
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,624.8	1,594.6	2,162.8
Advanced Alloys & Solutions [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 1,914.0	$ 1,664.0	$ 2,749.2

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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