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Multiemployer Pension Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Multiemployer Plan, Pension, Significant [Abstract]  
Multiemployer Plans
Pension Protection Act Zone Status
Contributions of AutoNation
($ in millions) (1)
Expiration Date of Collective-Bargaining Agreement
Pension FundEIN/Pension PlanNumber20202019202020192018
Surcharge Imposed (2)
Automotive Industries Pension Plan94-1133245 - 001RedRed$1.4 $1.6 $1.4 Yes(3)
IAM National Pension Fund51-6031295- 002RedRed0.2 0.2 0.2 Yes(4)
Other funds0.1 0.1 0.1 
Total contributions$1.7 $1.9 $1.7 
(1)    Our stores were not listed in the Automotive Industries Pension Plan’s or IAM National Pension Fund’s Form 5500 as providing more than 5% of the total contributions for the plan years ended December 31, 2019 or 2018.
(2)    We paid surcharges to the Automotive Industries Pension Plan of $0.6 million, $0.8 million, and $0.6 million in 2020, 2019, and 2018 respectively. Surcharges to the IAM National Pension Fund commenced in 2019 and were de minimis.
(3)    We are party to three collective-bargaining agreements that require contributions to the Automotive Industries Pension Plan. One agreement has an expiration date of December 31, 2021, and one agreement has an expiration date of December 31, 2022. One agreement expired on December 31, 2019, and is currently extended during collective bargaining for a new agreement.
(4)    We are party to two collective-bargaining agreements that require contributions to the IAM National Pension Fund. Both agreements have an expiration date of August 31, 2022.