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Exit or Disposal Cost Obligations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Restructuring Cost and Reserve [Line Items]  
Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] TOTAL COST OF SALES, Other Operating Income (Expense), Net, Selling, general, and administrative expenses, Depreciation and amortization
AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred $ 36.7
Accelerated Depreciation [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 3.9
Accelerated Amortization [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 3.2
Asset Impairment Charges [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 5.1
Contract Termination [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 3.2
Other Restructuring [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 2.6
Employee Severance [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 1.1
Parts and Service [Member] | Inventory Valuation Adjustment [Member] | AutoNation Collision Parts Closure [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred $ 17.6