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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,020.2	$ 869.1	$ 3,008.7	$ 2,615.2
Percent of total revenue	100.00%	100.00%	100.00%	100.00%
Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	84.00%	84.00%	84.00%	83.00%
Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	30.00%	28.00%	30.00%	27.00%
Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of total revenue	18.00%	19.00%	20.00%	19.00%
Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	17.00%	15.00%	17.00%
Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	14.00%	14.00%	14.00%	14.00%
Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	6.00%	6.00%	5.00%	6.00%
Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	16.00%	16.00%	17.00%
Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	9.00%	9.00%	9.00%
Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	4.00%	4.00%	4.00%	4.00%
Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of total revenue	3.00%	3.00%	3.00%	4.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 607.6	$ 506.5	$ 1,737.7	$ 1,555.7
Europe
Disaggregation of Revenue [Line Items]
Revenue	213.7	188.6	669.7	576.6
Asia
Disaggregation of Revenue [Line Items]
Revenue	144.9	120.3	439.4	317.5
Canada
Disaggregation of Revenue [Line Items]
Revenue	23.8	21.1	80.3	73.5
South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	30.2	32.6	81.6	91.9
Total Key Markets
Disaggregation of Revenue [Line Items]
Revenue	820.2	680.8	2,424.7	2,063.5
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	499.2	427.7	1,443.6	1,280.5
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	128.2	98.4	413.5	289.7
Automotive
Disaggregation of Revenue [Line Items]
Revenue	85.0	61.7	244.5	206.4
Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	59.9	48.5	180.3	144.2
Medical
Disaggregation of Revenue [Line Items]
Revenue	47.9	44.5	142.8	142.7
Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	58.8	54.5	181.3	168.9
Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	58.4	48.3	169.9	144.6
Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	41.3	42.3	109.7	108.2
Other
Disaggregation of Revenue [Line Items]
Revenue	41.5	43.2	123.1	130.0
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,067.7	898.6	3,137.2	2,711.8
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	$ 615.2	$ 526.3	$ 1,806.3	$ 1,593.3
Percent of total revenue	100.00%	100.00%	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	100.00%	100.00%	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	32.00%	30.00%	31.00%	30.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of total revenue	33.00%	33.00%	35.00%	32.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	25.00%	26.00%	24.00%	27.00%
Operating Segments | High Performance Materials & Components | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	10.00%	11.00%	10.00%	11.00%
Operating Segments | High Performance Materials & Components | Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 316.7	$ 273.4	$ 898.6	$ 820.5
Operating Segments | High Performance Materials & Components | Europe
Disaggregation of Revenue [Line Items]
Revenue	173.2	164.8	565.4	502.2
Operating Segments | High Performance Materials & Components | Asia
Disaggregation of Revenue [Line Items]
Revenue	60.9	45.1	180.7	127.3
Operating Segments | High Performance Materials & Components | Canada
Disaggregation of Revenue [Line Items]
Revenue	16.3	15.3	51.3	52.4
Operating Segments | High Performance Materials & Components | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	18.4	14.3	42.1	47.3
Operating Segments | High Performance Materials & Components | Total Key Markets
Disaggregation of Revenue [Line Items]
Revenue	541.6	478.4	1,603.9	1,444.1
Operating Segments | High Performance Materials & Components | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	446.5	389.5	1,311.7	1,169.7
Operating Segments | High Performance Materials & Components | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	17.9	14.3	51.4	49.7
Operating Segments | High Performance Materials & Components | Automotive
Disaggregation of Revenue [Line Items]
Revenue	2.0	2.4	7.4	6.4
Operating Segments | High Performance Materials & Components | Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	30.9	30.4	101.9	84.1
Operating Segments | High Performance Materials & Components | Medical
Disaggregation of Revenue [Line Items]
Revenue	44.3	41.8	131.5	134.2
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	0.2	0.2	0.3	1.0
Operating Segments | High Performance Materials & Components | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	18.5	13.5	55.1	37.6
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	1.0	1.1	4.7	3.5
Operating Segments | High Performance Materials & Components | Other
Disaggregation of Revenue [Line Items]
Revenue	24.2	19.7	74.1	63.5
Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 452.5	$ 372.3	$ 1,330.9	$ 1,118.5
Percent of total revenue	100.00%	100.00%	100.00%	100.00%
Operating Segments | Flat Rolled Products | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	66.00%	64.00%	66.00%	61.00%
Operating Segments | Flat Rolled Products | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	29.00%	27.00%	29.00%	23.00%
Operating Segments | Flat Rolled Products | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | Flat Rolled Products | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	3.00%	3.00%	5.00%	4.00%
Operating Segments | Flat Rolled Products | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	34.00%	34.00%	32.00%	34.00%
Operating Segments | Flat Rolled Products | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | Flat Rolled Products | Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	34.00%	36.00%	34.00%	39.00%
Operating Segments | Flat Rolled Products | Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	20.00%	20.00%	20.00%	22.00%
Operating Segments | Flat Rolled Products | Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	11.00%	10.00%	12.00%
Operating Segments | Flat Rolled Products | Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of total revenue	5.00%	5.00%	4.00%	5.00%
Operating Segments | Flat Rolled Products | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 290.9	$ 233.1	$ 839.1	$ 735.2
Operating Segments | Flat Rolled Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	40.5	23.8	104.3	74.4
Operating Segments | Flat Rolled Products | Asia
Disaggregation of Revenue [Line Items]
Revenue	84.0	75.2	258.7	190.2
Operating Segments | Flat Rolled Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	7.5	5.8	29.0	21.1
Operating Segments | Flat Rolled Products | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	11.8	18.3	39.5	44.6
Operating Segments | Flat Rolled Products | Total Key Markets
Disaggregation of Revenue [Line Items]
Revenue	278.6	202.4	820.8	619.4
Operating Segments | Flat Rolled Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	52.7	38.2	131.9	110.8
Operating Segments | Flat Rolled Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	110.3	84.1	362.1	240.0
Operating Segments | Flat Rolled Products | Automotive
Disaggregation of Revenue [Line Items]
Revenue	83.0	59.3	237.1	200.0
Operating Segments | Flat Rolled Products | Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	29.0	18.1	78.4	60.1
Operating Segments | Flat Rolled Products | Medical
Disaggregation of Revenue [Line Items]
Revenue	3.6	2.7	11.3	8.5
Operating Segments | Flat Rolled Products | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	58.6	54.3	181.0	167.9
Operating Segments | Flat Rolled Products | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	39.9	34.8	114.8	107.0
Operating Segments | Flat Rolled Products | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	40.3	41.2	105.0	104.7
Operating Segments | Flat Rolled Products | Other
Disaggregation of Revenue [Line Items]
Revenue	17.3	23.5	49.0	66.5
External Customers | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,020.2	869.1	3,008.7	2,615.2
External Customers | Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	585.5	512.9	1,738.1	1,549.7
External Customers | Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 434.7	$ 356.2	$ 1,270.6	$ 1,065.5

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