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Exit or Disposal Cost Obligations (Details) - AutoNation Collision Parts Closure - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | $ 36.5 |  | $ 36.7
Contract Termination Charges, Other Associated Closing Costs, and Involuntary Termination Benefits |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Liability for exit or disposal costs, beginning balance |  | $ 3.4 |
Costs Incurred |  | 0.0 |
Costs paid or otherwise settled |  | (3.3) |
Liability for exit or disposal costs, ending balance |  | 0.1 | 3.4
Contract Termination Charges |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
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
Contract Termination Charges | Other Operating Income (Expense) |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | 7.3 |  | 3.2
Other Associated Closing Costs |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
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
Other Associated Closing Costs | Selling, General and Administrative Expenses |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | 0.0 |  | 2.6
Involuntary Termination Benefits |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Liability for exit or disposal costs, beginning balance |  | 0.8 |
Costs Incurred |  | 0.0 |
Costs paid or otherwise settled |  | (0.7) |
Liability for exit or disposal costs, ending balance |  | $ 0.1 | 0.8
Involuntary Termination Benefits | Selling, General and Administrative Expenses |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | 0.8 |  | 1.1
Inventory Valuation Adjustment | Parts and Service [Member] | Cost of Sales |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | 20.6 |  | 17.6
Accelerated Depreciation | Depreciation and amortization |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | 2.9 |  | 3.9
Accelerated Amortization | Selling, General and Administrative Expenses |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | 2.1 |  | 3.2
Asset Impairment Charges | Other Operating Income (Expense) |  |  |
Liability for Exit or Disposal Costs [Rollforward] |  |  |
Costs Incurred | $ 2.8 |  | $ 5.1

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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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