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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 959.5	$ 616.2	$ 1,793.6	$ 1,308.7
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Nickel-based Alloys and Specialty Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	52.00%	38.00%	51.00%	41.00%
Precision and Engineered Strip [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	14.00%	19.00%	15.00%	20.00%
Precision Forgings, Casting and Components [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	15.00%	18.00%	15.00%	17.00%
Titanium and Titanium-based Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	11.00%	13.00%	10.00%	12.00%
Zirconium and Related Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	8.00%	12.00%	9.00%	10.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue	$ 568.6	$ 329.7	$ 1,046.3	$ 729.6
Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue	154.9	135.3	314.2	278.0
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	183.8	113.4	343.7	226.5
CANADA
Disaggregation of Revenue [Line Items]
Revenue	24.4	20.0	43.4	37.3
South America, Middle East, and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	27.8	17.8	46.0	37.3
Aerospace and Defense Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	436.4	281.2	803.2	535.4
Jet Engines- Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	248.7	129.6	445.3	235.7
Airframes- Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	106.1	54.4	199.8	112.6
Defense [Member]
Disaggregation of Revenue [Line Items]
Revenue	81.6	97.2	158.1	187.1
Energy
Disaggregation of Revenue [Line Items]
Revenue	200.3	118.3	360.0	267.4
Oil & Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue	125.2	56.1	228.3	138.6
Specialty Energy [Member]
Disaggregation of Revenue [Line Items]
Revenue	75.1	62.2	131.7	128.8
Automotive Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	75.5	68.0	166.5	159.5
Electronic Devices Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	49.4	43.3	101.0	98.9
Construction Mining Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	39.9	21.9	91.9	64.4
Food Equipment and Appliances Market
Disaggregation of Revenue [Line Items]
Revenue	62.7	20.7	96.7	56.1
Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	39.5	32.0	75.7	61.0
Other Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	55.8	30.8	98.6	66.0
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,062.9	658.1	1,979.3	1,399.3
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	$ 439.8	$ 318.7	$ 820.6	$ 583.9
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Nickel-based Alloys and Specialty Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	48.00%	45.00%	48.00%	41.00%
Operating Segments | High Performance Materials & Components | Precision and Engineered Strip [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Precision Forgings, Casting and Components [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	35.00%	36.00%	35.00%	39.00%
Operating Segments | High Performance Materials & Components | Titanium and Titanium-based Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	17.00%	19.00%	17.00%	20.00%
Operating Segments | High Performance Materials & Components | Zirconium and Related Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue	$ 179.8	$ 157.6	$ 336.2	$ 285.9
Operating Segments | High Performance Materials & Components | Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue	50.5	40.6	94.7	60.7
Operating Segments | High Performance Materials & Components | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	135.0	86.3	256.3	165.4
Operating Segments | High Performance Materials & Components | CANADA
Disaggregation of Revenue [Line Items]
Revenue	12.7	9.3	23.0	17.5
Operating Segments | High Performance Materials & Components | South America, Middle East, and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18.1	6.8	27.5	12.0
Operating Segments | High Performance Materials & Components | Aerospace and Defense Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	316.0	218.6	573.6	398.4
Operating Segments | High Performance Materials & Components | Jet Engines- Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	231.4	122.0	410.4	217.9
Operating Segments | High Performance Materials & Components | Airframes- Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	43.9	34.1	81.1	60.6
Operating Segments | High Performance Materials & Components | Defense [Member]
Disaggregation of Revenue [Line Items]
Revenue	40.7	62.5	82.1	119.9
Operating Segments | High Performance Materials & Components | Energy
Disaggregation of Revenue [Line Items]
Revenue	39.6	48.6	86.8	79.1
Operating Segments | High Performance Materials & Components | Oil & Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue	8.1	10.3	25.2	18.6
Operating Segments | High Performance Materials & Components | Specialty Energy [Member]
Disaggregation of Revenue [Line Items]
Revenue	31.5	38.3	61.6	60.5
Operating Segments | High Performance Materials & Components | Automotive Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	2.3	1.4	5.2	3.4
Operating Segments | High Performance Materials & Components | Electronic Devices Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	0.7	0.2	1.2	0.5
Operating Segments | High Performance Materials & Components | Construction Mining Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	7.9	6.1	16.3	11.2
Operating Segments | High Performance Materials & Components | Food Equipment and Appliances Market
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.1	0.0	0.1
Operating Segments | High Performance Materials & Components | Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	16.8	14.6	30.0	25.8
Operating Segments | High Performance Materials & Components | Other Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	12.8	11.0	24.6	23.0
Operating Segments | Advanced Alloys & Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 623.1	$ 339.4	$ 1,158.7	$ 815.4
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Nickel-based Alloys and Specialty Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	55.00%	31.00%	54.00%	40.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision and Engineered Strip [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	24.00%	39.00%	26.00%	35.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision Forgings, Casting and Components [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Titanium and Titanium-based Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	6.00%	6.00%	6.00%	6.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Zirconium and Related Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue	15.00%	24.00%	14.00%	19.00%
Operating Segments | Advanced Alloys & Solutions [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue	$ 388.8	$ 172.1	$ 710.1	$ 443.7
Operating Segments | Advanced Alloys & Solutions [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue	104.4	94.7	219.5	217.3
Operating Segments | Advanced Alloys & Solutions [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	48.8	27.1	87.4	61.1
Operating Segments | Advanced Alloys & Solutions [Member] | CANADA
Disaggregation of Revenue [Line Items]
Revenue	11.7	10.7	20.4	19.8
Operating Segments | Advanced Alloys & Solutions [Member] | South America, Middle East, and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	9.7	11.0	18.5	25.3
Operating Segments | Advanced Alloys & Solutions [Member] | Aerospace and Defense Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	120.4	62.6	229.6	137.0
Operating Segments | Advanced Alloys & Solutions [Member] | Jet Engines- Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	17.3	7.6	34.9	17.8
Operating Segments | Advanced Alloys & Solutions [Member] | Airframes- Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	62.2	20.3	118.7	52.0
Operating Segments | Advanced Alloys & Solutions [Member] | Defense [Member]
Disaggregation of Revenue [Line Items]
Revenue	40.9	34.7	76.0	67.2
Operating Segments | Advanced Alloys & Solutions [Member] | Energy
Disaggregation of Revenue [Line Items]
Revenue	160.7	69.7	273.2	188.3
Operating Segments | Advanced Alloys & Solutions [Member] | Oil & Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue	117.1	45.8	203.1	120.0
Operating Segments | Advanced Alloys & Solutions [Member] | Specialty Energy [Member]
Disaggregation of Revenue [Line Items]
Revenue	43.6	23.9	70.1	68.3
Operating Segments | Advanced Alloys & Solutions [Member] | Automotive Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	73.2	66.6	161.3	156.1
Operating Segments | Advanced Alloys & Solutions [Member] | Electronic Devices Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	48.7	43.1	99.8	98.4
Operating Segments | Advanced Alloys & Solutions [Member] | Construction Mining Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	32.0	15.8	75.6	53.2
Operating Segments | Advanced Alloys & Solutions [Member] | Food Equipment and Appliances Market
Disaggregation of Revenue [Line Items]
Revenue	62.7	20.6	96.7	56.0
Operating Segments | Advanced Alloys & Solutions [Member] | Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	22.7	17.4	45.7	35.2
Operating Segments | Advanced Alloys & Solutions [Member] | Other Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	43.0	19.8	74.0	43.0
External Customers | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	959.5	616.2	1,793.6	1,308.7
External Customers | Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	396.1	300.6	737.7	541.5
External Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 563.4	$ 315.6	$ 1,055.9	$ 767.2

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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