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Business Segments (Details3) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	$ 4,034.9	$ 5,634.6	$ 5,501.8
Deferred taxes	208.5	537.9
Cash and cash equivalents	645.9	490.8
Corporate, Non-Segment [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Deferred taxes	5.1	64.5	8.7
Cash and cash equivalents	727.1	624.4	502.0
High Performance Materials & Components
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	1,753.9	2,324.6	2,400.7
Advanced Alloys & Solutions [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	$ 1,548.8	$ 2,621.1	$ 2,590.4

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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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