Business Segments - Schedule of Business Segments (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 28, 2026 |
Jun. 29, 2025 |
Jun. 28, 2026 |
Jun. 29, 2025 |
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| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | $ 44.0 | $ 41.6 | $ 89.0 | $ 82.4 |
| Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | 44.0 | 41.6 | 89.0 | 82.4 |
| Capital expenditures | 68.6 | 72.1 | 123.8 | 125.4 |
| Operating Segments | HPMC | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | 20.6 | 20.9 | 40.2 | 40.6 |
| Capital expenditures | 45.2 | 45.2 | 73.6 | 74.6 |
| Operating Segments | AA&S | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | 21.8 | 19.1 | 45.5 | 38.6 |
| Capital expenditures | 21.9 | 26.2 | 46.7 | 49.2 |
| Operating Segments | Corporate | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | 1.6 | 1.6 | 3.3 | 3.2 |
| Capital expenditures | $ 1.5 | $ 0.7 | $ 3.5 | $ 1.6 |
| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of expenditure for addition to long-lived asset included in determination of segment asset by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Long-lived asset excludes financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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