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Restructuring and Related Activities (Details) - AutoNation Collision Parts Closure [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred $ 36.7
Cumulative Costs Incurred 36.7
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 36.7
Contract Termination Charges, Other Associated Closing Costs, and Involuntary Termination Benefits [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 6.9
Liability for Exit or Disposal Costs [Roll Forward]  
Liability for exit or disposal costs, beginning balance 0.0
Costs incurred 6.9
Costs paid or otherwise settled (3.5)
Liability for exit or disposal costs, ending balance 3.4
Contract Termination [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 3.2
Liability for Exit or Disposal Costs [Roll Forward]  
Liability for exit or disposal costs, beginning balance 0.0
Costs incurred 3.2
Costs paid or otherwise settled (3.0)
Liability for exit or disposal costs, ending balance 0.2
Other Restructuring [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 2.6
Liability for Exit or Disposal Costs [Roll Forward]  
Liability for exit or disposal costs, beginning balance 0.0
Costs incurred 2.6
Costs paid or otherwise settled (0.2)
Liability for exit or disposal costs, ending balance 2.4
Employee Severance [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative Costs Incurred 1.1
Liability for Exit or Disposal Costs [Roll Forward]  
Liability for exit or disposal costs, beginning balance 0.0
Costs incurred 1.1
Costs paid or otherwise settled (0.3)
Liability for exit or disposal costs, ending balance 0.8
Other Operating Income (Expense) [Member] | Asset Impairment Charges [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 5.1
Cumulative Costs Incurred 5.1
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 5.1
Other Operating Income (Expense) [Member] | Contract Termination [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 3.2
Cumulative Costs Incurred 3.2
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 3.2
Selling, General and Administrative Expenses [Member] | Accelerated Amortization [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 3.2
Cumulative Costs Incurred 3.2
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 3.2
Selling, General and Administrative Expenses [Member] | Other Restructuring [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 2.6
Cumulative Costs Incurred 2.6
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 2.6
Selling, General and Administrative Expenses [Member] | Employee Severance [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 1.1
Cumulative Costs Incurred 1.1
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 1.1
Depreciation and amortization [Member] | Accelerated Depreciation [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 3.9
Cumulative Costs Incurred 3.9
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred 3.9
Parts and Service [Member] | Cost of Sales [Member] | Inventory Valuation Adjustment [Member]  
Restructuring Cost and Reserve [Line Items]  
Total Costs Expected to be Incurred 17.6
Cumulative Costs Incurred 17.6
Liability for Exit or Disposal Costs [Roll Forward]  
Costs incurred $ 17.6