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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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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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