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Derivative Financial Instruments - Narrative (Details)
$ in Millions
Oct. 02, 2020
USD ($)
Jun. 01, 2019
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
option
Derivative [Line Items]        
Non-trade floor plan notes payable     $ 1,480.7 $ 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 | option       2
Interest Rate Contract        
Derivative [Line Items]        
Agreement term   5 years    
Aggregate notional amount   $ 300.0    
Non-trade floor plan notes payable   $ 1,500.0    
Interest Rate Contract | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Agreement term 5 years      
Aggregate notional amount $ 60.0      
Derivative liability     1.2  
Derivative asset     $ 1.2