Other Assets (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	$ 13.3
2015	13.3
2016	13.3
2017	13.3
2018	13.3
Goodwill [Line Items]
Goodwill	565.3	$ 2.4
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	222.9	4.8
Intangible Assets, Net (Excluding Goodwill)	215.2	1.2
Finite-Lived Intangible Asset, Expected Amortization, Year One	13.3
Finite-Lived Intangible Asset, Expected Amortization, Year Two	13.3
Finite-Lived Intangible Asset, Expected Amortization, Year Four	$ 13.3
Finite-Lived Intangible Assets, Remaining Amortization Period	16 years 4 months 24 days
Finite-Lived Intangible Asset, Expected Amortization, Year Three	$ 13.3
Finite-Lived Intangible Asset, Expected Amortization, Year Five	13.3
Fuselage Systems [Member]
Goodwill [Line Items]
Goodwill	42.9
Propulsion Systems [Member]
Goodwill [Line Items]
Goodwill	33.1
Wing Systems [Member]
Goodwill [Line Items]
Goodwill	2.5	2.4
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	2.0	2.0
Finite-Lived Intangible Assets, Accumulated Amortization	(2.0)	(1.9)
Favorable Leasehold [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	0.1
2015	0.1
2016	0.1
2017	0.1
2018	0.1
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	2.8	2.8
Finite-Lived Intangible Assets, Accumulated Amortization	(1.8)	(1.7)
Finite-Lived Intangible Asset, Expected Amortization, Year One	0.1
Finite-Lived Intangible Asset, Expected Amortization, Year Two	0.1
Finite-Lived Intangible Asset, Expected Amortization, Year Four	$ 0.1
Finite-Lived Intangible Assets, Remaining Amortization Period	8 years 6 months
Finite-Lived Intangible Asset, Expected Amortization, Year Three	$ 0.1
Finite-Lived Intangible Asset, Expected Amortization, Year Five	0.1
Developed Technology
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	6.3
2015	6.3
2016	6.3
2017	6.3
2018	6.3
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	94.0	0.0
Finite-Lived Intangible Assets, Accumulated Amortization	(2.6)	0.0
Finite-Lived Intangible Asset, Expected Amortization, Year One	6.3
Finite-Lived Intangible Asset, Expected Amortization, Year Two	6.3
Finite-Lived Intangible Asset, Expected Amortization, Year Four	$ 6.3
Finite-Lived Intangible Assets, Remaining Amortization Period	14 years 7 months 6 days
Finite-Lived Intangible Asset, Expected Amortization, Year Three	$ 6.3
Finite-Lived Intangible Asset, Expected Amortization, Year Five	6.3
Customer Contracts
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	6.9
2015	6.9
2016	6.9
2017	6.9
2018	6.9
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	124.1	0.0
Finite-Lived Intangible Assets, Accumulated Amortization	(1.3)	$ 0.0
Finite-Lived Intangible Asset, Expected Amortization, Year One	6.9
Finite-Lived Intangible Asset, Expected Amortization, Year Two	6.9
Finite-Lived Intangible Asset, Expected Amortization, Year Four	$ 6.9
Finite-Lived Intangible Assets, Remaining Amortization Period	17 years 9 months 18 days
Finite-Lived Intangible Asset, Expected Amortization, Year Three	$ 6.9
Finite-Lived Intangible Asset, Expected Amortization, Year Five	$ 6.9