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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 979.0	$ 865.9
Percent of total revenue	100.00%	100.00%
Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	84.00%	82.00%
Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	29.00%	26.00%
Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of total revenue	21.00%	18.00%
Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	18.00%
Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	13.00%	14.00%
Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	5.00%	6.00%
Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	18.00%
Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	10.00%
Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	4.00%	5.00%
Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of total revenue	3.00%	3.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 554.3	$ 525.0
Europe
Disaggregation of Revenue [Line Items]
Revenue	225.5	186.4
Asia
Disaggregation of Revenue [Line Items]
Revenue	150.8	102.7
Canada
Disaggregation of Revenue [Line Items]
Revenue	27.2	23.9
South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	21.2	27.9
Total Key Markets
Disaggregation of Revenue [Line Items]
Revenue	791.3	687.7
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	462.4	417.2
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	152.7	92.8
Automotive
Disaggregation of Revenue [Line Items]
Revenue	79.1	75.9
Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	52.2	51.6
Medical
Disaggregation of Revenue [Line Items]
Revenue	44.9	50.2
Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	58.9	59.0
Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	55.6	50.0
Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	32.9	34.5
Other
Disaggregation of Revenue [Line Items]
Revenue	40.3	34.7
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	$ 560.7	$ 510.4
Percent of total revenue	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%
Operating Segments | High Performance Materials & Components | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	29.00%	30.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of total revenue	38.00%	31.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	24.00%	28.00%
Operating Segments | High Performance Materials & Components | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	11.00%
Operating Segments | High Performance Materials & Components | Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	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%
Operating Segments | High Performance Materials & Components | Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%
Operating Segments | High Performance Materials & Components | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 289.8	$ 275.2
Operating Segments | High Performance Materials & Components | Europe
Disaggregation of Revenue [Line Items]
Revenue	197.0	161.0
Operating Segments | High Performance Materials & Components | Asia
Disaggregation of Revenue [Line Items]
Revenue	48.3	42.1
Operating Segments | High Performance Materials & Components | Canada
Disaggregation of Revenue [Line Items]
Revenue	16.6	17.1
Operating Segments | High Performance Materials & Components | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	9.0	15.0
Operating Segments | High Performance Materials & Components | Total Key Markets
Disaggregation of Revenue [Line Items]
Revenue	516.5	476.6
Operating Segments | High Performance Materials & Components | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	426.7	381.4
Operating Segments | High Performance Materials & Components | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	15.2	16.5
Operating Segments | High Performance Materials & Components | Automotive
Disaggregation of Revenue [Line Items]
Revenue	2.6	2.0
Operating Segments | High Performance Materials & Components | Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	30.8	29.6
Operating Segments | High Performance Materials & Components | Medical
Disaggregation of Revenue [Line Items]
Revenue	41.2	47.1
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	0.1	0.3
Operating Segments | High Performance Materials & Components | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	17.6	11.5
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	1.5	1.2
Operating Segments | High Performance Materials & Components | Other
Disaggregation of Revenue [Line Items]
Revenue	25.0	20.8
Operating Segments | Flat Rolled Products
Disaggregation of Revenue [Line Items]
Revenue	$ 418.3	$ 355.5
Percent of total revenue	100.00%	100.00%
Operating Segments | Flat Rolled Products | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	67.00%	59.00%
Operating Segments | Flat Rolled Products | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	31.00%	20.00%
Operating Segments | Flat Rolled Products | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%
Operating Segments | Flat Rolled Products | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	5.00%	4.00%
Operating Segments | Flat Rolled Products | Precision and engineered strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	31.00%	35.00%
Operating Segments | Flat Rolled Products | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%
Operating Segments | Flat Rolled Products | Total Standard Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	33.00%	41.00%
Operating Segments | Flat Rolled Products | Stainless steel sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	20.00%	24.00%
Operating Segments | Flat Rolled Products | Specialty stainless sheet
Disaggregation of Revenue [Line Items]
Percent of total revenue	9.00%	12.00%
Operating Segments | Flat Rolled Products | Stainless steel plate and other
Disaggregation of Revenue [Line Items]
Percent of total revenue	4.00%	5.00%
Operating Segments | Flat Rolled Products | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 264.5	$ 249.8
Operating Segments | Flat Rolled Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	28.5	25.4
Operating Segments | Flat Rolled Products | Asia
Disaggregation of Revenue [Line Items]
Revenue	102.5	60.6
Operating Segments | Flat Rolled Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	10.6	6.8
Operating Segments | Flat Rolled Products | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue	12.2	12.9
Operating Segments | Flat Rolled Products | Total Key Markets
Disaggregation of Revenue [Line Items]
Revenue	274.8	211.1
Operating Segments | Flat Rolled Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	35.7	35.8
Operating Segments | Flat Rolled Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	137.5	76.3
Operating Segments | Flat Rolled Products | Automotive
Disaggregation of Revenue [Line Items]
Revenue	76.5	73.9
Operating Segments | Flat Rolled Products | Electrical Energy
Disaggregation of Revenue [Line Items]
Revenue	21.4	22.0
Operating Segments | Flat Rolled Products | Medical
Disaggregation of Revenue [Line Items]
Revenue	3.7	3.1
Operating Segments | Flat Rolled Products | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	58.8	58.7
Operating Segments | Flat Rolled Products | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	38.0	38.5
Operating Segments | Flat Rolled Products | Electronics/Computers/Communications
Disaggregation of Revenue [Line Items]
Revenue	31.4	33.3
Operating Segments | Flat Rolled Products | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 15.3	$ 13.9

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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