Flight Equipment Held for Sale (Details) $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2016 aircraft	Dec. 31, 2015 USD ($) aircraft	Sep. 30, 2016 USD ($) aircraft	Sep. 30, 2016 USD ($) aircraft	Dec. 31, 2015 USD ($) aircraft
ATR Turboprop
Number of aircraft sold or agreed to be sold		25	2	3
Number of aircraft delivered		20
Number of aircraft undelivered		5
Embraer E190
Number of aircraft sold or agreed to be sold			3
Embraer E175
Number of aircraft sold or agreed to be sold			1
Aircraft Held For Sale
Number of aircraft undelivered					19
Long-lived assets held for sale | $		$ 305.9			$ 305.9
Aircraft Held For Sale | ATR Turboprop
Number of aircraft delivered				2
Aircraft Held For Sale | Embraer Aircraft
Number of aircraft undelivered				17
Long-lived assets held for sale | $			$ 460.3	$ 460.3
Nordic Aviation Capital | ATR Turboprop
Number of aircraft sold or agreed to be sold				20
Nordic Aviation Capital | Embraer Aircraft
Number of aircraft sold or agreed to be sold				8
Nordic Aviation Capital | Embraer E190
Number of aircraft sold or agreed to be sold	25
Nordic Aviation Capital | Embraer E175
Number of aircraft sold or agreed to be sold	25