Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Subsequent events (Details)

v3.19.3.a.u2
Subsequent events (Details)
1 Months Ended 12 Months Ended
Feb. 29, 2020
aircraft
Dec. 31, 2019
USD ($)
aircraft
Jan. 31, 2020
USD ($)
Nov. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Oct. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Feb. 28, 2018
USD ($)
Subsequent Event [Line Items]                  
Share repurchase program, authorized amount | $   $ 100,000,000   $ 200,000,000 $ 200,000,000 $ 200,000,000 $ 200,000,000 $ 200,000,000 $ 200,000,000
Subsequent Event                  
Subsequent Event [Line Items]                  
Share repurchase program, authorized amount | $     $ 250,000,000            
Capital Addition Purchase Commitments                  
Subsequent Event [Line Items]                  
Number of forward orders   299              
Capital Addition Purchase Commitments | Flight Equipment                  
Subsequent Event [Line Items]                  
Number of forward orders   297              
Airbus 320 neoFamily Aircraft | Capital Addition Purchase Commitments | Flight Equipment | Subsequent Event                  
Subsequent Event [Line Items]                  
Number of forward orders 50