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Exit or Disposal Cost Obligations (Details) $ in Millions | 12 Months Ended
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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

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