Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 28, 2026 |
Jun. 29, 2025 |
Jun. 28, 2026 |
Jun. 29, 2025 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 1,261.1
|
$ 1,140.4
|
$ 2,412.6
|
$ 2,284.8
|
| Percent of revenue |
100.00%
|
100.00%
|
100.00%
|
100.00%
|
| Nickel-based alloys and specialty alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
51.00%
|
48.00%
|
50.00%
|
48.00%
|
| Precision forgings, castings and components |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
18.00%
|
21.00%
|
19.00%
|
21.00%
|
| Titanium and titanium-based alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
15.00%
|
17.00%
|
16.00%
|
18.00%
|
| Zirconium and related alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
11.00%
|
9.00%
|
10.00%
|
8.00%
|
| Precision rolled strip products |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
5.00%
|
5.00%
|
5.00%
|
5.00%
|
| United States |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 797.3
|
$ 650.4
|
$ 1,489.8
|
$ 1,294.2
|
| Europe |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
232.8
|
235.8
|
481.5
|
496.5
|
| Asia |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
109.5
|
149.2
|
213.4
|
263.5
|
| Canada |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
43.2
|
39.9
|
85.4
|
79.7
|
| South America, Middle East and other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
78.3
|
65.1
|
142.5
|
150.9
|
| Aerospace & Defense: |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
862.0
|
761.8
|
1,659.6
|
1,516.2
|
| Jet Engines - Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
508.3
|
447.8
|
980.3
|
869.2
|
| Airframes - Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
191.7
|
195.2
|
378.3
|
401.0
|
| Defense |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
162.0
|
118.8
|
301.0
|
246.0
|
| Total Other Markets |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
399.1
|
378.6
|
753.0
|
768.6
|
| Specialty Energy |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
59.2
|
63.5
|
120.8
|
114.0
|
| Electronics |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
38.2
|
43.7
|
66.5
|
83.3
|
| Medical |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
23.0
|
38.9
|
50.5
|
81.3
|
| Automotive |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
72.3
|
64.8
|
133.8
|
125.4
|
| Conventional Energy |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
103.5
|
92.9
|
187.7
|
214.7
|
| Construction/Mining |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
34.9
|
33.3
|
73.9
|
66.2
|
| Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
68.0
|
41.5
|
119.8
|
83.7
|
| Operating Segments |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
1,423.8
|
1,240.6
|
2,716.0
|
2,502.3
|
| Operating Segments | HPMC |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 681.2
|
$ 662.1
|
$ 1,336.6
|
$ 1,306.1
|
| Percent of revenue |
100.00%
|
100.00%
|
100.00%
|
100.00%
|
| Operating Segments | HPMC | Nickel-based alloys and specialty alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
51.00%
|
44.00%
|
48.00%
|
43.00%
|
| Operating Segments | HPMC | Precision forgings, castings and components |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
35.00%
|
39.00%
|
36.00%
|
39.00%
|
| Operating Segments | HPMC | Titanium and titanium-based alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
14.00%
|
17.00%
|
16.00%
|
18.00%
|
| Operating Segments | HPMC | Zirconium and related alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| Operating Segments | HPMC | Precision rolled strip products |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| Operating Segments | HPMC | United States |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 380.2
|
$ 350.3
|
$ 715.8
|
$ 666.7
|
| Operating Segments | HPMC | Europe |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
173.8
|
168.7
|
375.4
|
360.0
|
| Operating Segments | HPMC | Asia |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
36.4
|
43.8
|
73.3
|
77.1
|
| Operating Segments | HPMC | Canada |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
21.9
|
17.0
|
41.7
|
37.1
|
| Operating Segments | HPMC | South America, Middle East and other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
24.8
|
29.0
|
45.2
|
52.0
|
| Operating Segments | HPMC | Aerospace & Defense: |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
590.0
|
558.7
|
1,158.7
|
1,096.2
|
| Operating Segments | HPMC | Jet Engines - Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
462.0
|
419.6
|
893.0
|
816.9
|
| Operating Segments | HPMC | Airframes - Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
74.5
|
77.3
|
153.2
|
159.1
|
| Operating Segments | HPMC | Defense |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
53.5
|
61.8
|
112.5
|
120.2
|
| Operating Segments | HPMC | Total Other Markets |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
47.1
|
50.1
|
92.7
|
96.7
|
| Operating Segments | HPMC | Specialty Energy |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
15.3
|
14.7
|
30.9
|
27.1
|
| Operating Segments | HPMC | Electronics |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
0.0
|
0.0
|
0.0
|
0.0
|
| Operating Segments | HPMC | Medical |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
7.7
|
15.4
|
17.4
|
31.2
|
| Operating Segments | HPMC | Automotive |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
1.0
|
2.8
|
1.7
|
4.2
|
| Operating Segments | HPMC | Conventional Energy |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
2.7
|
1.4
|
4.6
|
3.1
|
| Operating Segments | HPMC | Construction/Mining |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
10.9
|
8.1
|
22.6
|
15.2
|
| Operating Segments | HPMC | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
9.5
|
7.7
|
15.5
|
15.9
|
| Operating Segments | AA&S |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 742.6
|
$ 578.5
|
$ 1,379.4
|
$ 1,196.2
|
| Percent of revenue |
100.00%
|
100.00%
|
100.00%
|
100.00%
|
| Operating Segments | AA&S | Nickel-based alloys and specialty alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
52.00%
|
53.00%
|
52.00%
|
54.00%
|
| Operating Segments | AA&S | Precision forgings, castings and components |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
0.00%
|
0.00%
|
0.00%
|
0.00%
|
| Operating Segments | AA&S | Titanium and titanium-based alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
16.00%
|
17.00%
|
16.00%
|
17.00%
|
| Operating Segments | AA&S | Zirconium and related alloys |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
22.00%
|
19.00%
|
21.00%
|
18.00%
|
| Operating Segments | AA&S | Precision rolled strip products |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Percent of revenue |
10.00%
|
11.00%
|
11.00%
|
11.00%
|
| Operating Segments | AA&S | United States |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 417.1
|
$ 300.1
|
$ 774.0
|
$ 627.5
|
| Operating Segments | AA&S | Europe |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
59.0
|
67.1
|
106.1
|
136.5
|
| Operating Segments | AA&S | Asia |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
73.1
|
105.4
|
140.1
|
186.4
|
| Operating Segments | AA&S | Canada |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
21.3
|
22.9
|
43.7
|
42.6
|
| Operating Segments | AA&S | South America, Middle East and other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
53.5
|
36.1
|
97.3
|
98.9
|
| Operating Segments | AA&S | Aerospace & Defense: |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
272.0
|
203.1
|
500.9
|
420.0
|
| Operating Segments | AA&S | Jet Engines - Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
46.3
|
28.2
|
87.3
|
52.3
|
| Operating Segments | AA&S | Airframes - Commercial |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
117.2
|
117.9
|
225.1
|
241.9
|
| Operating Segments | AA&S | Defense |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
108.5
|
57.0
|
188.5
|
125.8
|
| Operating Segments | AA&S | Total Other Markets |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
352.0
|
328.5
|
660.3
|
671.9
|
| Operating Segments | AA&S | Specialty Energy |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
43.9
|
48.8
|
89.9
|
86.9
|
| Operating Segments | AA&S | Electronics |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
38.2
|
43.7
|
66.5
|
83.3
|
| Operating Segments | AA&S | Medical |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
15.3
|
23.5
|
33.1
|
50.1
|
| Operating Segments | AA&S | Automotive |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
71.3
|
62.0
|
132.1
|
121.2
|
| Operating Segments | AA&S | Conventional Energy |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
100.8
|
91.5
|
183.1
|
211.6
|
| Operating Segments | AA&S | Construction/Mining |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
24.0
|
25.2
|
51.3
|
51.0
|
| Operating Segments | AA&S | Other |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
58.5
|
33.8
|
104.3
|
67.8
|
| Sales to external customers | Operating Segments |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
1,261.1
|
1,140.4
|
2,412.6
|
2,284.8
|
| Sales to external customers | Operating Segments | HPMC |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
637.1
|
608.8
|
1,251.4
|
1,192.9
|
| Sales to external customers | Operating Segments | AA&S |
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
| Revenue |
$ 624.0
|
$ 531.6
|
$ 1,161.2
|
$ 1,091.9
|