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Multiemployer Pension Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) agreements store	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Multiemployer Plans [Line Items]
Contributions of AutoNation, insignificant plans	$ 0.1	$ 0.1	$ 0.1
Total Contributions	1.5	1.6	1.5
Automotive Industries Pension Plan [Member]
Multiemployer Plans [Line Items]
Contributions of AutoNation, significant plans	$ 1.2	1.3	1.2
Surcharge imposed	Yes
Surcharges paid	$ 0.6	$ 0.6	0.5
Pension protection act zone status	Red	Red
Number of collective-bargaining arrangements that require contributions to the Plan | agreements	3
Potential withdrawal obligation	$ 14.0
IAM National Pension Plan [Member]
Multiemployer Plans [Line Items]
Contributions of AutoNation, significant plans	$ 0.2	$ 0.2	$ 0.2
Surcharge imposed	Yes
Pension protection act zone status	Red	Red
Number of collective-bargaining arrangements that require contributions to the Plan | agreements	2
Potential withdrawal obligation	$ 4.0
Dealerships [Member]
Multiemployer Plans [Line Items]
Number of stores | store	252
Dealerships [Member] | Multiemployer Plans, Pension [Member]
Multiemployer Plans [Line Items]
Number of stores | store	5

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Amount of surcharge paid by an employer to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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