Segment Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 26, 2019 USD ($)	Jun. 27, 2019 USD ($)	Mar. 28, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 27, 2018 USD ($)	Jun. 28, 2018 USD ($)	Mar. 29, 2018 USD ($)	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Percentage Of Net Revenue Derived From Two Largest Customers									95.00%
Number Of Largest Customers | customer									2
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold									$ 6,786,400,000	$ 6,135,900,000	$ 6,195,300,000
Segment Revenues
Revenues	$ 1,959,300,000	$ 1,919,900,000	$ 2,016,100,000	$ 1,967,800,000	$ 1,835,300,000	$ 1,813,700,000	$ 1,836,900,000	$ 1,736,100,000	7,863,100,000	7,222,000,000.0	6,983,000,000.0
Segment Operating Income
Business Segment Operating Income									1,064,800,000	1,086,300,000	804,400,000
Corporate SG&A (2)									(261,400,000)	(210,400,000)	(204,700,000)
Unallocated impact of severe weather event									0	10,000,000.0	(19,900,000)
Research and development									(54,500,000)	(42,500,000)	(31,200,000)
Unallocated cost of sales									11,900,000	(200,000)	(16,700,000)
Operating income	$ 95,700,000	$ 206,100,000	$ 226,000,000.0	$ 233,000,000.0	$ 243,600,000	$ 222,500,000	$ 217,600,000	$ 159,500,000	760,800,000	843,200,000	531,900,000
Textuals [Abstract]
Incentive Compensation Included In Unallocated Cost Of Sale											12,700,000
Change In Estimate To Increase Warranty And Extraordinary Rework Reserve Included In Unallocated Cost Of Sale									13,900,000	1,100,000	1,800,000
Fuselage Systems [Member]
Segment Revenues
Revenues									4,206,200,000	4,000,800,000	3,730,800,000
Segment Operating Income
Business Segment Operating Income									440,800,000	576,100,000	329,600,000
Propulsion Systems [Member]
Segment Revenues
Revenues									2,057,800,000	1,702,500,000	1,666,200,000
Segment Operating Income
Business Segment Operating Income									404,600,000	283,500,000	267,700,000
Wing Systems [Member]
Segment Revenues
Revenues									1,588,300,000	1,513,000,000.0	1,578,800,000
Segment Operating Income
Business Segment Operating Income									216,000,000.0	226,400,000	205,100,000
Other Systems [Member]
Segment Revenues
Revenues									10,800,000	5,700,000	7,200,000
Segment Operating Income
Business Segment Operating Income									$ 3,400,000	300,000	$ 2,000,000.0
Impact of 2017-07 [Member] | Fuselage Systems [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold										18.1
Impact of 2017-07 [Member] | Propulsion Systems [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold										7.4
Impact of 2017-07 [Member] | Wing Systems [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold										$ 7.3