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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Aug. 01, 2017
Dec. 31, 2016
Nov. 04, 2014
Blackbird            
Investments            
Percentage of equity ownership           9.50%
Gain (loss) on sale of aircraft   $ (0.3) $ 0.8      
Due from affiliate $ 0.7 0.7     $ 0.7  
Equity method investment 31.9 31.9     $ 25.1  
Blackbird Capital II            
Investments            
Percentage of equity ownership       9.50%    
Gain (loss) on sale of aircraft 1.8 1.8        
Equity method investment $ 3.1 $ 3.1