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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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- Definition 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 + Details
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