Property, Plant and Equipment, net (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment Textuals [Abstract]
Capitalized Interest Related To Construction-In-Progress	$ 5.0	$ 6.5	$ 6.7
Repair And Maintenance Costs	119.7	142.2	136.2
Depreciation Expense Related To Capitalized Software	16.1	$ 17.7	$ 16.7
B-737 [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Gain (Loss) on Disposition of Assets	(19.2)
A350 XWB recurring program [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Gain (Loss) on Disposition of Assets	$ (3.7)