Flight Equipment held for sale (Details) - Aircraft Held For Sale $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019 aircraft	Sep. 30, 2019 USD ($) aircraft	Dec. 31, 2018 USD ($) aircraft
Flight Equipment Held for Sale
Number of aircraft sold or agreed to be sold | aircraft	6	6	6
Flight Equipment, Net | $		$ 208.5	$ 241.6