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Number Of Largest Customers

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
Segment Information (Details) $ in Millions	Dec. 31, 2020 USD ($)	Oct. 01, 2020 USD ($)	Jul. 02, 2020 USD ($)	Apr. 02, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 26, 2019 USD ($)	Jun. 27, 2019 USD ($)	Mar. 28, 2019 USD ($)	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Percentage Of Net Revenue Derived From Two Largest Customers									83.00%
Number Of Largest Customers \| customer									2
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold									$ 3,845.5	$ 6,786.4	$ 6,135.9
Segment Revenues
Revenues	$ 876.6	$ 806.3	$ 644.6	$ 1,077.3	$ 1,959.3	$ 1,919.9	$ 2,016.1	$ 1,967.8	3,404.8	7,863.1	7,222.0
Segment Operating Income
Business Segment Operating Income									(524.7)	1,064.8	1,086.3
Corporate SG&A									(237.4)	(261.4)	(210.4)
Unallocated impact of severe weather event									0.0	0.0	10.0
Research and development									(38.8)	(54.5)	(42.5)
Unallocated cost of sales									(11.9)	11.9	(0.2)
Operating (loss) income	(101.4)	(176.9)	(367.0)	(167.5)	$ 95.7	$ 206.1	$ 226.0	$ 233.0	(812.8)	760.8	843.2
Textuals [Abstract]
Excess Capacity Costs- B737MAX and A320 Production Schedules	50.1	72.6	82.8	73.4					278.9
Abnormal Costs- COVID19 production suspension	(0.1)	(10.9)	19.3	25.4					33.7
Restructuring Charges	$ 4.6	$ 19.5	$ 6.3	$ 42.6					73.0	0.0	0.0
Product Warranty Expense									(3.3)	(13.9)	(1.1)
Fuselage Systems [Member]
Segment Revenues
Revenues									1,725.9	4,206.2	4,000.8
Segment Operating Income
Business Segment Operating Income									(454.5)	440.8	576.1
Textuals [Abstract]
Excess Capacity Costs- B737MAX and A320 Production Schedules									175.0
Abnormal Costs- COVID19 production suspension									19.0
Restructuring Charges									41.3
Gain (Loss) on Disposition of Assets									(22.5)
Propulsion Systems [Member]
Segment Revenues
Revenues									784.5	2,057.8	1,702.5
Segment Operating Income
Business Segment Operating Income									(36.8)	404.6	283.5
Textuals [Abstract]
Excess Capacity Costs- B737MAX and A320 Production Schedules									61.1
Abnormal Costs- COVID19 production suspension									7.2
Restructuring Charges									15.2
Wing Systems [Member]
Segment Revenues
Revenues									798.6	1,588.3	1,513.0
Segment Operating Income
Business Segment Operating Income									(68.1)	216.0	226.4
Textuals [Abstract]
Excess Capacity Costs- B737MAX and A320 Production Schedules									42.9
Abnormal Costs- COVID19 production suspension									7.5
Restructuring Charges									16.5
Gain (Loss) on Disposition of Assets									0.4
Other Systems [Member]
Segment Revenues
Revenues									95.8	10.8	5.7
Segment Operating Income
Business Segment Operating Income									34.7	$ 3.4	$ 0.3
A350 XWB recurring program [Member]
Textuals [Abstract]
Gain (Loss) on Disposition of Assets									$ 3.7