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Goodwill - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill [Line Items]        
Changes to carrying amount of goodwill     $ 0  
Aviation        
Goodwill [Line Items]        
Impairment loss as a result of goodwill $ 0 $ 59,500,000 $ 0 $ 59,500,000