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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Sales	$ 959.5	$ 616.2	$ 1,793.6	$ 1,308.7
Segment EBITDA	164.9	73.2	308.3	147.5
Corporate expenses	(16.7)	(15.9)	(33.7)	(28.1)
Closed operations and other expense	(5.1)	(3.6)	(6.5)	(3.1)
Depreciation & amortization	(36.0)	(36.3)	(71.5)	(72.4)
Interest expense, net	(23.4)	(23.7)	(47.0)	(47.1)
Income (loss) from equity investments	10.0	0.0	10.4	0.0
Restructuring and other credits (charges)	1.3	6.2	(6.2)	6.2
Strike Related Costs	0.0	(40.3)	0.0	(40.3)
Gain (loss) on asset sales and sale of businesses, net	(115.9)	0.0	(134.2)	0.0
Income (loss) before income taxes	(30.9)	(40.4)	9.2	(37.3)
Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless
Segment Reporting Information [Line Items]
Income (loss) from equity investments	9.5	(0.4)	9.2	(0.9)
Operating Segments
Segment Reporting Information [Line Items]
Sales	1,062.9	658.1	1,979.3	1,399.3
Depreciation & amortization	(36.0)	(36.3)	(71.5)	(72.4)
Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	439.8	318.7	820.6	583.9
Segment EBITDA	60.3	37.2	128.4	61.8
Depreciation & amortization	(16.9)	(19.2)	(34.8)	(38.8)
Strike Related Costs		(2.1)
Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	623.1	339.4	1,158.7	815.4
Segment EBITDA	104.6	36.0	179.9	85.7
Depreciation & amortization	(16.7)	(16.1)	(32.9)	(31.6)
Strike Related Costs		(38.2)
Operating Segments | Corporate Segment
Segment Reporting Information [Line Items]
Depreciation & amortization	(2.4)	(1.0)	(3.8)	(2.0)
Internal Customers | Operating Segments
Segment Reporting Information [Line Items]
Sales	103.4	41.9	185.7	90.6
Internal Customers | Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	43.7	18.1	82.9	42.4
Internal Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	59.7	23.8	102.8	48.2
External Customers | Operating Segments
Segment Reporting Information [Line Items]
Sales	959.5	616.2	1,793.6	1,308.7
External Customers | Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	396.1	300.6	737.7	541.5
External Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	$ 563.4	$ 315.6	$ 1,055.9	$ 767.2

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