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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,004.8	$ 979.0
Percent of revenue	100.00%	100.00%
Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue	87.00%	86.00%
Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	30.00%	30.00%
Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue	19.00%	21.00%
Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	19.00%	16.00%
Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of revenue	13.00%	14.00%
Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	6.00%	5.00%
Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of revenue	13.00%	14.00%
Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of revenue	7.00%	8.00%
Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of revenue	4.00%	4.00%
Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of revenue	2.00%	2.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 621.1	$ 554.3
Europe
Disaggregation of Revenue [Line Items]
Revenue	211.0	225.5
Asia
Disaggregation of Revenue [Line Items]
Revenue	123.2	150.8
Canada
Disaggregation of Revenue [Line Items]
Revenue	26.4	27.2
South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	23.1	21.2
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	525.6	462.4
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	112.8	152.7
Automotive
Disaggregation of Revenue [Line Items]
Revenue	76.9	79.1
Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	57.9	55.6
Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	55.7	52.2
Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	53.2	58.9
Medical
Disaggregation of Revenue [Line Items]
Revenue	46.1	44.9
Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	34.1	32.9
Other
Disaggregation of Revenue [Line Items]
Revenue	42.5	40.3
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,051.1	1,018.5
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	$ 623.9	$ 579.4
Percent of revenue	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	31.00%	29.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue	32.00%	38.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	27.00%	24.00%
Operating Segments | High Performance Materials & Components | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	10.00%	9.00%
Operating Segments | High Performance Materials & Components | Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 336.0	$ 289.8
Operating Segments | High Performance Materials & Components | Europe
Disaggregation of Revenue [Line Items]
Revenue	178.3	197.0
Operating Segments | High Performance Materials & Components | Asia
Disaggregation of Revenue [Line Items]
Revenue	52.8	48.3
Operating Segments | High Performance Materials & Components | Canada
Disaggregation of Revenue [Line Items]
Revenue	19.1	16.6
Operating Segments | High Performance Materials & Components | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	15.0	9.0
Operating Segments | High Performance Materials & Components | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	465.1	426.7
Operating Segments | High Performance Materials & Components | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	16.7	15.2
Operating Segments | High Performance Materials & Components | Automotive
Disaggregation of Revenue [Line Items]
Revenue	3.6	2.6
Operating Segments | High Performance Materials & Components | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	18.5	17.6
Operating Segments | High Performance Materials & Components | Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	27.3	30.8
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	0.1	0.1
Operating Segments | High Performance Materials & Components | Medical
Disaggregation of Revenue [Line Items]
Revenue	42.7	41.2
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	1.1	1.5
Operating Segments | High Performance Materials & Components | Other
Disaggregation of Revenue [Line Items]
Revenue	26.1	25.0
Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 427.2	$ 439.1
Percent of revenue	100.00%	100.00%
Operating Segments | Flat Rolled Products | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue	68.00%	67.00%
Operating Segments | Flat Rolled Products | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	29.00%	31.00%
Operating Segments | Flat Rolled Products | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | Flat Rolled Products | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	6.00%	5.00%
Operating Segments | Flat Rolled Products | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of revenue	33.00%	31.00%
Operating Segments | Flat Rolled Products | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%
Operating Segments | Flat Rolled Products | Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of revenue	32.00%	33.00%
Operating Segments | Flat Rolled Products | Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of revenue	17.00%	20.00%
Operating Segments | Flat Rolled Products | Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of revenue	11.00%	9.00%
Operating Segments | Flat Rolled Products | Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of revenue	4.00%	4.00%
Operating Segments | Flat Rolled Products | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 285.1	$ 264.5
Operating Segments | Flat Rolled Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	32.7	28.5
Operating Segments | Flat Rolled Products | Asia
Disaggregation of Revenue [Line Items]
Revenue	70.4	102.5
Operating Segments | Flat Rolled Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	7.3	10.6
Operating Segments | Flat Rolled Products | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	8.1	12.2
Operating Segments | Flat Rolled Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	60.5	35.7
Operating Segments | Flat Rolled Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	96.1	137.5
Operating Segments | Flat Rolled Products | Automotive
Disaggregation of Revenue [Line Items]
Revenue	73.3	76.5
Operating Segments | Flat Rolled Products | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	39.4	38.0
Operating Segments | Flat Rolled Products | Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	28.4	21.4
Operating Segments | Flat Rolled Products | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	53.1	58.8
Operating Segments | Flat Rolled Products | Medical
Disaggregation of Revenue [Line Items]
Revenue	3.4	3.7
Operating Segments | Flat Rolled Products | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	33.0	31.4
Operating Segments | Flat Rolled Products | Other
Disaggregation of Revenue [Line Items]
Revenue	16.4	15.3
External Customers | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,004.8	979.0
External Customers | Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	601.2	560.7
External Customers | Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 403.6	$ 418.3

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Revenue from Contract with Customer, Excluding Assessed Tax, Percentage of Revenue

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