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Related Party Transactions (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 18, 2018
USD ($)
Aug. 26, 2016
Aug. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]                    
Rent expense               $ 16.8 $ 18.7 $ 19.1
Proceeds from sale of aircraft           $ 4.9 $ 1.3      
Estimated termination payment               $ 44.6    
Tax receivable agreement liability, discount rate (percent)               5.87%    
Affiliated Entity                    
Related Party Transaction [Line Items]                    
Rent expense               $ 6.5 6.9 8.0
Proceeds from sale of aircraft         $ 0.7          
Affiliated Entity | Western Airways, Inc.                    
Related Party Transaction [Line Items]                    
Net charter expense                 $ 1.1 $ 1.3
Commissions paid     $ 0.2              
Affiliated Entity | Mosing Aviation, LLC                    
Related Party Transaction [Line Items]                    
Proceeds from sale of aircraft       $ 0.7            
Affiliated Entity | Mosing Holdings                    
Related Party Transaction [Line Items]                    
Conversion ratio, preferred stock to common stock (percent)   1                
Tax benefits realized payable (percent)               85.00%    
Percentage retained under tax receivable agreement (percent)               15.00%    
Cumulative loss period               36 months    
Tax receivable agreement, liability               $ 0.2    
Real Property Acquisition From Mosing Companies | Affiliated Entity                    
Related Party Transaction [Line Items]                    
Purchase from related party $ 37.0                  
Term for certain rights and obligations within agreement 10 years                  
Real Property Acquisition From Mosing Companies | Affiliated Entity | Buildings and improvements                    
Related Party Transaction [Line Items]                    
Purchase from related party               $ 18.5