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Inventories and Related Notes Payable - Floor Plan (Tables)
 12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories consist of the following:
 December 31, 2021December 31, 2020
 (In millions)
New vehicles$273.1 $648.4 
Used vehicles807.2 413.2 
Service loaners106.3 128.5 
Parts, accessories and other74.6 57.2 
Net inventories$1,261.2 $1,247.3