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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,018.7	$ 1,020.2	$ 3,103.9	$ 3,008.7
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue	87.00%	85.00%	87.00%	85.00%
Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	33.00%	30.00%	32.00%	30.00%
Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue	16.00%	18.00%	18.00%	20.00%
Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	19.00%	16.00%	18.00%	16.00%
Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of revenue	14.00%	15.00%	13.00%	14.00%
Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	5.00%	6.00%	6.00%	5.00%
Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of revenue	13.00%	15.00%	13.00%	15.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 605.4	$ 607.6	$ 1,867.0	$ 1,737.7
Europe
Disaggregation of Revenue [Line Items]
Revenue	186.3	213.7	604.5	669.7
Asia
Disaggregation of Revenue [Line Items]
Revenue	164.5	144.9	459.6	439.4
Canada
Disaggregation of Revenue [Line Items]
Revenue	25.6	23.8	81.4	80.3
South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	36.9	30.2	91.4	81.6
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	503.5	499.2	1,601.3	1,443.6
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	147.3	128.2	396.1	413.5
Energy
Disaggregation of Revenue [Line Items]
Revenue	69.9	59.9	203.0	180.3
Automotive
Disaggregation of Revenue [Line Items]
Revenue	73.6	85.0	224.1	244.5
Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	43.7	58.4	154.2	169.9
Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	53.6	58.8	156.4	181.3
Medical
Disaggregation of Revenue [Line Items]
Revenue	41.0	47.9	129.5	142.8
Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	44.5	41.3	116.7	109.7
Other
Disaggregation of Revenue [Line Items]
Revenue	41.6	41.5	122.6	123.1
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,069.4	1,067.7	3,256.1	3,137.2
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	$ 577.3	$ 615.2	$ 1,875.0	$ 1,806.3
Percent of 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 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 revenue	33.00%	32.00%	31.00%	31.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue	29.00%	33.00%	31.00%	35.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	29.00%	25.00%	28.00%	24.00%
Operating Segments | High Performance Materials & Components | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	9.00%	10.00%	10.00%	10.00%
Operating Segments | High Performance Materials & Components | Standard stainless products
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	$ 312.0	$ 316.7	$ 1,005.6	$ 898.6
Operating Segments | High Performance Materials & Components | Europe
Disaggregation of Revenue [Line Items]
Revenue	150.3	173.2	509.7	565.4
Operating Segments | High Performance Materials & Components | Asia
Disaggregation of Revenue [Line Items]
Revenue	48.4	60.9	161.7	180.7
Operating Segments | High Performance Materials & Components | Canada
Disaggregation of Revenue [Line Items]
Revenue	21.2	16.3	64.8	51.3
Operating Segments | High Performance Materials & Components | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	19.8	18.4	53.5	42.1
Operating Segments | High Performance Materials & Components | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	437.9	446.5	1,415.3	1,311.7
Operating Segments | High Performance Materials & Components | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	13.9	17.9	49.0	51.4
Operating Segments | High Performance Materials & Components | Energy
Disaggregation of Revenue [Line Items]
Revenue	36.5	30.9	97.9	101.9
Operating Segments | High Performance Materials & Components | Automotive
Disaggregation of Revenue [Line Items]
Revenue	2.3	2.0	9.0	7.4
Operating Segments | High Performance Materials & Components | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	5.4	18.5	37.3	55.1
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	0.2	0.2	0.3	0.3
Operating Segments | High Performance Materials & Components | Medical
Disaggregation of Revenue [Line Items]
Revenue	37.7	44.3	119.0	131.5
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	1.7	1.0	4.0	4.7
Operating Segments | High Performance Materials & Components | Other
Disaggregation of Revenue [Line Items]
Revenue	16.1	24.2	63.5	74.1
Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 492.1	$ 452.5	$ 1,381.1	$ 1,330.9
Percent of 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 revenue	71.00%	66.00%	70.00%	66.00%
Operating Segments | Flat Rolled Products | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	34.00%	29.00%	33.00%	29.00%
Operating Segments | Flat Rolled Products | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of 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 revenue	7.00%	3.00%	6.00%	5.00%
Operating Segments | Flat Rolled Products | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of revenue	30.00%	34.00%	31.00%	32.00%
Operating Segments | Flat Rolled Products | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue	0.00%	0.00%	0.00%	0.00%
Operating Segments | Flat Rolled Products | Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of revenue	29.00%	34.00%	30.00%	34.00%
Operating Segments | Flat Rolled Products | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 293.4	$ 290.9	$ 861.4	$ 839.1
Operating Segments | Flat Rolled Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	36.0	40.5	94.8	104.3
Operating Segments | Flat Rolled Products | Asia
Disaggregation of Revenue [Line Items]
Revenue	116.1	84.0	297.9	258.7
Operating Segments | Flat Rolled Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	4.4	7.5	16.6	29.0
Operating Segments | Flat Rolled Products | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	17.1	11.8	37.9	39.5
Operating Segments | Flat Rolled Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	65.6	52.7	186.0	131.9
Operating Segments | Flat Rolled Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	133.4	110.3	347.1	362.1
Operating Segments | Flat Rolled Products | Energy
Disaggregation of Revenue [Line Items]
Revenue	33.4	29.0	105.1	78.4
Operating Segments | Flat Rolled Products | Automotive
Disaggregation of Revenue [Line Items]
Revenue	71.3	83.0	215.1	237.1
Operating Segments | Flat Rolled Products | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	38.3	39.9	116.9	114.8
Operating Segments | Flat Rolled Products | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	53.4	58.6	156.1	181.0
Operating Segments | Flat Rolled Products | Medical
Disaggregation of Revenue [Line Items]
Revenue	3.3	3.6	10.5	11.3
Operating Segments | Flat Rolled Products | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	42.8	40.3	112.7	105.0
Operating Segments | Flat Rolled Products | Other
Disaggregation of Revenue [Line Items]
Revenue	25.5	17.3	59.1	49.0
External Customers | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,018.7	1,020.2	3,103.9	3,008.7
External Customers | Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	551.7	585.5	1,795.3	1,738.1
External Customers | Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 467.0	$ 434.7	$ 1,308.6	$ 1,270.6

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
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