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Exit or Disposal Cost Obligations (Details) - AutoNation Collision Parts Closure - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Liability for Exit or Disposal Costs [Rollforward] |  |
Costs Incurred |  | $ 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
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
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

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