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Exit or Disposal Cost Obligations (Details) - AutoNation Collision Parts Closure [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | $ 36.7
Contract Termination Charges, Other Associated Closing Costs, and Involuntary Termination Benefits [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Liability for exit or disposal costs, beginning balance | $ 3.4 |
Costs incurred | 0.0 |
Costs paid or otherwise settled | (3.4) |
Liability for exit or disposal costs, ending balance | 0.0 | 3.4
Contract Termination [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Liability for exit or disposal costs, beginning balance | 0.2 |
Costs incurred | 0.0 |
Costs paid or otherwise settled | (0.2) |
Liability for exit or disposal costs, ending balance | 0.0 | 0.2
Other Restructuring [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Liability for exit or disposal costs, beginning balance | 2.4 |
Costs incurred | 0.0 |
Costs paid or otherwise settled | (2.4) |
Liability for exit or disposal costs, ending balance | 0.0 | 2.4
Employee Severance [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Liability for exit or disposal costs, beginning balance | 0.8 |
Costs incurred | 0.0 |
Costs paid or otherwise settled | (0.8) |
Liability for exit or disposal costs, ending balance | $ 0.0 | 0.8
Other Operating Income (Expense) [Member] | Asset Impairment Charges [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | 5.1
Other Operating Income (Expense) [Member] | Contract Termination [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | 3.2
Selling, General and Administrative Expenses [Member] | Accelerated Amortization [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | 3.2
Selling, General and Administrative Expenses [Member] | Other Restructuring [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | 2.6
Selling, General and Administrative Expenses [Member] | Employee Severance [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | 1.1
Depreciation and amortization [Member] | Accelerated Depreciation [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | 3.9
Parts and Service [Member] | Cost of Sales [Member] | Inventory Valuation Adjustment [Member] |  |
Liability for Exit or Disposal Costs [Roll Forward] |  |
Costs incurred |  | $ 17.6

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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