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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenue $ 1,018.6 $ 1,018.7 $ 1,080.4 $ 1,004.8 $ 1,037.9 $ 1,020.2 $ 1,009.5 $ 979.0 $ 4,122.5 $ 4,046.6 $ 3,525.1
Percent of total revenue                 100.00% 100.00% 100.00%
Total High-Value Products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 86.00% 84.00% 82.00%
Nickel-based alloys and specialty alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 32.00% 30.00% 28.00%
Precision forgings, castings and components                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 18.00% 20.00% 19.00%
Titanium and titanium-based alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 18.00% 17.00% 17.00%
Precision rolled strip products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 12.00% 12.00% 12.00%
Zirconium and related alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 6.00% 5.00% 6.00%
Standard stainless products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 14.00% 16.00% 18.00%
United States                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 2,454.6 $ 2,348.1 $ 2,070.6
China                      
Disaggregation of Revenue [Line Items]                      
Revenue                 355.6 320.0 265.6
Germany                      
Disaggregation of Revenue [Line Items]                      
Revenue                 219.3 247.2 217.1
United Kingdom                      
Disaggregation of Revenue [Line Items]                      
Revenue                 173.8 242.1 231.6
France                      
Disaggregation of Revenue [Line Items]                      
Revenue                 155.5 183.6 165.6
Japan                      
Disaggregation of Revenue [Line Items]                      
Revenue                 147.7 214.9 131.7
Rest of World                      
Disaggregation of Revenue [Line Items]                      
Revenue                 616.0 490.7 442.9
Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,130.4 1,965.5 1,718.1
Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue                 796.9 780.7 610.4
Automotive                      
Disaggregation of Revenue [Line Items]                      
Revenue                 296.6 323.4 273.7
Food Equipment & Appliances                      
Disaggregation of Revenue [Line Items]                      
Revenue                 205.8 244.9 226.0
Construction/Mining                      
Disaggregation of Revenue [Line Items]                      
Revenue                 195.0 226.0 192.9
Medical                      
Disaggregation of Revenue [Line Items]                      
Revenue                 172.4 183.1 183.0
Electronics/Computers/Communications                      
Disaggregation of Revenue [Line Items]                      
Revenue                 163.2 156.9 151.6
Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 162.2 166.1 169.4
Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Revenue                 4,446.4 4,341.6 3,758.0
Operating Segments | High Performance Materials & Components                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 2,054.2 $ 2,039.2 $ 1,751.1
Percent of total revenue                 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%
Operating Segments | High Performance Materials & Components | Nickel-based alloys and specialty alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 38.00% 37.00% 37.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 36.00% 40.00% 38.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 26.00% 23.00% 25.00%
Operating Segments | High Performance Materials & Components | Precision rolled strip products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 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                 0.00% 0.00% 0.00%
Operating Segments | High Performance Materials & Components | Standard stainless products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 0.00% 0.00% 0.00%
Operating Segments | High Performance Materials & Components | United States                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 1,042.6 $ 983.6 $ 874.3
Operating Segments | High Performance Materials & Components | China                      
Disaggregation of Revenue [Line Items]                      
Revenue                 93.9 71.2 44.3
Operating Segments | High Performance Materials & Components | Germany                      
Disaggregation of Revenue [Line Items]                      
Revenue                 147.2 159.0 131.9
Operating Segments | High Performance Materials & Components | United Kingdom                      
Disaggregation of Revenue [Line Items]                      
Revenue                 156.7 225.6 200.8
Operating Segments | High Performance Materials & Components | France                      
Disaggregation of Revenue [Line Items]                      
Revenue                 132.7 146.3 143.3
Operating Segments | High Performance Materials & Components | Japan                      
Disaggregation of Revenue [Line Items]                      
Revenue                 95.0 128.1 88.5
Operating Segments | High Performance Materials & Components | Rest of World                      
Disaggregation of Revenue [Line Items]                      
Revenue                 310.4 249.3 221.7
Operating Segments | High Performance Materials & Components | Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,624.1 1,562.9 1,377.0
Operating Segments | High Performance Materials & Components | Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue                 153.6 133.9 119.7
Operating Segments | High Performance Materials & Components | Automotive                      
Disaggregation of Revenue [Line Items]                      
Revenue                 10.5 9.5 8.8
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0.3 0.4 0.4
Operating Segments | High Performance Materials & Components | Construction/Mining                      
Disaggregation of Revenue [Line Items]                      
Revenue                 42.5 72.7 51.2
Operating Segments | High Performance Materials & Components | Medical                      
Disaggregation of Revenue [Line Items]                      
Revenue                 85.4 106.0 81.1
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0.5 1.5 1.0
Operating Segments | High Performance Materials & Components | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 61.6 76.2 65.6
Operating Segments | Advanced Alloys & Solutions                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 2,392.2 $ 2,302.4 $ 2,006.9
Percent of total revenue                 100.00% 100.00% 100.00%
Operating Segments | Advanced Alloys & Solutions | Total High-Value Products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 72.00% 68.00% 66.00%
Operating Segments | Advanced Alloys & Solutions | Nickel-based alloys and specialty alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 27.00% 24.00% 20.00%
Operating Segments | Advanced Alloys & Solutions | Precision forgings, castings and components                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 0.00% 0.00% 0.00%
Operating Segments | Advanced Alloys & Solutions | Titanium and titanium-based alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 11.00% 10.00% 10.00%
Operating Segments | Advanced Alloys & Solutions | Precision rolled strip products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 23.00% 23.00% 24.00%
Operating Segments | Advanced Alloys & Solutions | Zirconium and related alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 11.00% 11.00% 12.00%
Operating Segments | Advanced Alloys & Solutions | Standard stainless products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 28.00% 32.00% 34.00%
Operating Segments | Advanced Alloys & Solutions | United States                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 1,412.0 $ 1,364.5 $ 1,196.3
Operating Segments | Advanced Alloys & Solutions | China                      
Disaggregation of Revenue [Line Items]                      
Revenue                 261.7 248.8 221.3
Operating Segments | Advanced Alloys & Solutions | Germany                      
Disaggregation of Revenue [Line Items]                      
Revenue                 72.1 88.2 85.2
Operating Segments | Advanced Alloys & Solutions | United Kingdom                      
Disaggregation of Revenue [Line Items]                      
Revenue                 17.1 16.5 30.8
Operating Segments | Advanced Alloys & Solutions | France                      
Disaggregation of Revenue [Line Items]                      
Revenue                 22.8 37.3 22.3
Operating Segments | Advanced Alloys & Solutions | Japan                      
Disaggregation of Revenue [Line Items]                      
Revenue                 52.7 86.8 43.2
Operating Segments | Advanced Alloys & Solutions | Rest of World                      
Disaggregation of Revenue [Line Items]                      
Revenue                 305.6 241.4 221.2
Operating Segments | Advanced Alloys & Solutions | Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Revenue                 506.3 402.6 341.1
Operating Segments | Advanced Alloys & Solutions | Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue                 643.3 646.8 490.7
Operating Segments | Advanced Alloys & Solutions | Automotive                      
Disaggregation of Revenue [Line Items]                      
Revenue                 286.1 313.9 264.9
Operating Segments | Advanced Alloys & Solutions | Food Equipment & Appliances                      
Disaggregation of Revenue [Line Items]                      
Revenue                 205.5 244.5 225.6
Operating Segments | Advanced Alloys & Solutions | Construction/Mining                      
Disaggregation of Revenue [Line Items]                      
Revenue                 152.5 153.3 141.7
Operating Segments | Advanced Alloys & Solutions | Medical                      
Disaggregation of Revenue [Line Items]                      
Revenue                 87.0 77.1 101.9
Operating Segments | Advanced Alloys & Solutions | Electronics/Computers/Communications                      
Disaggregation of Revenue [Line Items]                      
Revenue                 162.7 155.4 150.6
Operating Segments | Advanced Alloys & Solutions | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 100.6 89.9 103.8
External Customers | Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Revenue                 4,122.5 4,046.6 3,525.1
External Customers | Operating Segments | High Performance Materials & Components                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,978.5 1,963.1 1,704.8
External Customers | Operating Segments | Advanced Alloys & Solutions                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 2,144.0 $ 2,083.5 $ 1,820.3