Restructuring and Related Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 7.2	$ 0.2	$ 8.2
Excess Capacity Costs- B737MAX and A320 Production Schedules	184.1	157.3
Commercial [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6.3	0.2	6.8
Abnormal Costs- COVID19 production suspension		9.6	12.0
Excess Capacity Costs- B737MAX and A320 Production Schedules	177.3	149.5	206.7
Defense & Space [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0.9	0.0	1.1
Excess Capacity Costs- B737MAX and A320 Production Schedules	$ 6.8	7.8	10.8
Aftermarket [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 0.0	$ 0.3