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Derivative Financial Instruments - Narrative (Details)
$ in Millions
Jun. 15, 2021
USD ($)
derivative
Oct. 02, 2020
USD ($)
derivative
Jun. 01, 2019
USD ($)
Sep. 30, 2021
USD ($)
derivative
Dec. 31, 2020
USD ($)
Derivative [Line Items]          
Non-trade floor plan notes payable       $ 688.9 $ 1,563.0
Amount of net losses expected to reclassify from AOCI into interest expense in earnings within the next twelve months       $ 2.7  
Interest Rate Cap | Not Designated as Hedging Instrument          
Derivative [Line Items]          
Number of derivative instruments entered during period | derivative 2 2      
Number of derivative instruments held | derivative       4  
Interest Rate Contract          
Derivative [Line Items]          
Agreement term     5 years    
Aggregate notional amount     $ 300.0    
Non-trade floor plan notes payable     $ 688.2    
Interest Rate Contract | Not Designated as Hedging Instrument          
Derivative [Line Items]          
Agreement term 5 years 5 years      
Aggregate notional amount $ 100.0 $ 100.0      
Derivative liability       $ 4.2  
Derivative asset       $ 4.2