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Inventories
 3 Months Ended
Mar. 29, 2026
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories at March 29, 2026 and December 28, 2025 were as follows (in millions):
March 29,
2026		December 28,
2025
Raw materials and supplies$308.6 $245.6 
Work-in-process1,268.2 1,137.4 
Finished goods103.5 100.6 
1,680.3 1,483.6 
Inventory valuation reserves(100.0)(80.4)
Total inventories, net$1,580.3 $1,403.2 
Inventories are stated at the lower of cost (first-in, first-out (FIFO) and average cost methods) or net realizable value.