Advance Payments and Deferred Revenue/Credits (Details) $ / ship_set in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / ship_set	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Deferred Revenue Arrangement [Line Items]
Customer advances	$ 231,900,000
Increase (Decrease) in Customer Advances	$ 120,800,000	$ (98,300,000)	$ (209,600,000)
Advance payments and deferred revenue/credits summarized
Amortization Of Advances Per Ship Set (dollars per ship set) | $ / ship_set	450
B737 [Member]
Deferred Revenue Arrangement [Line Items]
Increase (Decrease) in Customer Advances	$ 123.0