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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                 87.00% 86.00% 84.00%
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 and engineered strip                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 13.00% 14.00% 14.00%
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                 13.00% 14.00% 16.00%
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
Oil & Gas                      
Disaggregation of Revenue [Line Items]                      
Revenue                 510.6 546.2 418.2
Automotive                      
Disaggregation of Revenue [Line Items]                      
Revenue                 296.6 323.4 273.7
Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue                 286.3 234.5 192.2
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                 4,322.8 4,212.6 3,654.5
Operating Segments | High Performance Materials & Components                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 2,501.9 $ 2,413.6 $ 2,127.0
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                 32.00% 31.00% 31.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 30.00% 34.00% 32.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 28.00% 25.00% 26.00%
Operating Segments | High Performance Materials & Components | Precision and engineered strip                      
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                 10.00% 10.00% 11.00%
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                 $ 1,319.7 $ 1,214.1 $ 1,096.5
Operating Segments | High Performance Materials & Components | China                      
Disaggregation of Revenue [Line Items]                      
Revenue                 103.0 83.1 51.1
Operating Segments | High Performance Materials & Components | Germany                      
Disaggregation of Revenue [Line Items]                      
Revenue                 178.2 192.7 170.5
Operating Segments | High Performance Materials & Components | United Kingdom                      
Disaggregation of Revenue [Line Items]                      
Revenue                 164.9 232.4 220.9
Operating Segments | High Performance Materials & Components | France                      
Disaggregation of Revenue [Line Items]                      
Revenue                 145.8 172.7 157.8
Operating Segments | High Performance Materials & Components | Japan                      
Disaggregation of Revenue [Line Items]                      
Revenue                 104.4 136.5 95.2
Operating Segments | High Performance Materials & Components | Rest of World                      
Disaggregation of Revenue [Line Items]                      
Revenue                 382.1 302.7 275.4
Operating Segments | High Performance Materials & Components | Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,879.1 1,771.3 1,568.9
Operating Segments | High Performance Materials & Components | Oil & Gas                      
Disaggregation of Revenue [Line Items]                      
Revenue                 64.3 74.9 63.9
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 | Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue                 156.9 131.4 113.1
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances                      
Disaggregation of Revenue [Line Items]                      
Revenue                 0.3 0.4 1.1
Operating Segments | High Performance Materials & Components | Construction/Mining                      
Disaggregation of Revenue [Line Items]                      
Revenue                 42.5 72.8 51.1
Operating Segments | High Performance Materials & Components | Medical                      
Disaggregation of Revenue [Line Items]                      
Revenue                 159.2 168.5 170.4
Operating Segments | High Performance Materials & Components | Electronics/Computers/Communications                      
Disaggregation of Revenue [Line Items]                      
Revenue                 5.8 7.9 4.4
Operating Segments | High Performance Materials & Components | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 79.5 97.5 85.7
Operating Segments | Flat Rolled Products                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 1,820.9 $ 1,799.0 $ 1,527.5
Percent of total revenue                 100.00% 100.00% 100.00%
Operating Segments | Flat Rolled Products | Total High-Value Products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 70.00% 66.00% 63.00%
Operating Segments | Flat Rolled Products | Nickel-based alloys and specialty alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 32.00% 28.00% 24.00%
Operating Segments | Flat Rolled Products | Precision forgings, castings and components                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 0.00% 0.00% 0.00%
Operating Segments | Flat Rolled Products | Titanium and titanium-based alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 6.00% 5.00% 5.00%
Operating Segments | Flat Rolled Products | Precision and engineered strip                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 32.00% 33.00% 34.00%
Operating Segments | Flat Rolled Products | Zirconium and related alloys                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 0.00% 0.00% 0.00%
Operating Segments | Flat Rolled Products | Standard stainless products                      
Disaggregation of Revenue [Line Items]                      
Percent of total revenue                 30.00% 34.00% 37.00%
Operating Segments | Flat Rolled Products | United States                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 1,134.9 $ 1,134.0 $ 974.1
Operating Segments | Flat Rolled Products | China                      
Disaggregation of Revenue [Line Items]                      
Revenue                 252.6 236.9 214.5
Operating Segments | Flat Rolled Products | Germany                      
Disaggregation of Revenue [Line Items]                      
Revenue                 41.1 54.5 46.6
Operating Segments | Flat Rolled Products | United Kingdom                      
Disaggregation of Revenue [Line Items]                      
Revenue                 8.9 9.7 10.7
Operating Segments | Flat Rolled Products | France                      
Disaggregation of Revenue [Line Items]                      
Revenue                 9.7 10.9 7.8
Operating Segments | Flat Rolled Products | Japan                      
Disaggregation of Revenue [Line Items]                      
Revenue                 43.3 78.4 36.5
Operating Segments | Flat Rolled Products | Rest of World                      
Disaggregation of Revenue [Line Items]                      
Revenue                 233.9 188.0 167.5
Operating Segments | Flat Rolled Products | Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Revenue                 251.3 194.2 149.2
Operating Segments | Flat Rolled Products | Oil & Gas                      
Disaggregation of Revenue [Line Items]                      
Revenue                 446.3 471.3 354.3
Operating Segments | Flat Rolled Products | Automotive                      
Disaggregation of Revenue [Line Items]                      
Revenue                 286.1 313.9 264.9
Operating Segments | Flat Rolled Products | Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue                 129.4 103.1 79.1
Operating Segments | Flat Rolled Products | Food Equipment & Appliances                      
Disaggregation of Revenue [Line Items]                      
Revenue                 205.5 244.5 224.9
Operating Segments | Flat Rolled Products | Construction/Mining                      
Disaggregation of Revenue [Line Items]                      
Revenue                 152.5 153.2 141.8
Operating Segments | Flat Rolled Products | Medical                      
Disaggregation of Revenue [Line Items]                      
Revenue                 13.2 14.6 12.6
Operating Segments | Flat Rolled Products | Electronics/Computers/Communications                      
Disaggregation of Revenue [Line Items]                      
Revenue                 157.4 149.0 147.2
Operating Segments | Flat Rolled Products | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue                 82.7 68.6 83.7
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                 2,398.1 2,334.2 2,067.4
External Customers | Operating Segments | Flat Rolled Products                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 1,724.4 $ 1,712.4 $ 1,457.7