Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Sales	$ 3,836.0	$ 2,799.8	$ 2,982.1
Operating Segments
Segment Reporting Information [Line Items]
Sales	4,249.4	3,010.7	3,182.9
Operating Segments | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales	413.4	210.9	200.8
Operating Segments | External Sales [Member]
Segment Reporting Information [Line Items]
Sales	3,836.0	2,799.8	2,982.1
Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	1,815.7	1,248.3	1,235.4
Operating Segments | High Performance Materials & Components | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales	174.5	93.2	70.8
Operating Segments | High Performance Materials & Components | External Sales [Member]
Segment Reporting Information [Line Items]
Sales	1,641.2	1,155.1	1,164.6
Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	2,433.7	1,762.4	1,947.5
Operating Segments | Advanced Alloys & Solutions [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales	238.9	117.7	130.0
Operating Segments | Advanced Alloys & Solutions [Member] | External Sales [Member]
Segment Reporting Information [Line Items]
Sales	$ 2,194.8	$ 1,644.7	$ 1,817.5