Inventory (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 28, 2023	Sep. 28, 2023	Dec. 31, 2022
Summary Of Inventories [Abstract]
Raw materials	$ 395.4	$ 395.4	$ 332.7
Work-in-process	1,226.2	1,226.2	1,044.9
Finished goods	46.8	46.8	69.4
Product inventory	1,668.4	1,668.4	1,447.0
Capitalized pre-production	21.6	21.6	23.7
Total inventory, net	1,690.0	1,690.0	1,470.7
Inventory Valuation Reserves	148.3	148.3	136.8
Costs Incurred in Anticipation of Contracts	256.3	256.3	$ 392.2
Excess Capacity Costs- B737MAX and A320 Production Schedules	56.4	152.9
Inventories [Line Items]
Excess Capacity Costs- B737MAX and A320 Production Schedules	$ 56.4	$ 152.9