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Variable Interest Entities (Details)
$ in Millions
12 Months Ended
Jul. 31, 2018
Air_craft
Dec. 31, 2018
USD ($)
Air_craft
Variable Interest Entity [Line Items]    
Assets in partnership   $ 231.8
Number of Aircraft engines | Air_craft   23
Jet Holding S.a.r.l. [Member]    
Variable Interest Entity [Line Items]    
Ownreship interest 100.00%  
Weisel Capital Management LLC [Member]    
Variable Interest Entity [Line Items]    
Assets in partnership   $ 227.0
FAN Engine Securitization Ltd [Member]    
Variable Interest Entity [Line Items]    
Number of Aircraft engines | Air_craft 24  
FAN Engine Securitization Ltd [Member] | Other Income [Member]    
Variable Interest Entity [Line Items]    
Gain recognized upon consolidation   $ 15.3
FAN Engine Securitization Ltd [Member] | Jet Holding S.a.r.l. [Member]    
Variable Interest Entity [Line Items]    
Ownreship interest 100.00%