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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Intangible Assets |
Intangible Assets | 8. Intangible Assets ​ Following is a summary of the changes in the carrying amount of goodwill and other indefinite-lived intangible assets during the years ended December 31, 2020, and 2019 net of accumulated impairment losses recorded prior to December 31, 2012, of $606.3 million and $37.1 million, respectively: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Other Indefinite-
​ | ​ | ​ | ​ | ​ | Lived Intangible
​ | ​ | Goodwill | ​ | Assets
Balance — December 31, 2018 | ​ | $ | 1,752.0 | ​ | $ | 486.2
Additions | ​ |  | 146.6 | ​ |  | 67.4
Disposals | ​ |  | (3.9) | ​ |  | (1.2)
Impairment | ​ | ​ | — | ​ | ​ | (1.9)
Foreign currency translation | ​ | ​ | 16.3 | ​ | ​ | 1.7
Balance — December 31, 2019 | ​ | $ | 1,911.0 | ​ | $ | 552.2
Additions | ​ |  | — | ​ |  | 2.5
Disposals | ​ | ​ | (8.8) | ​ | ​ | —
Impairment | ​ | ​ | — | ​ | ​ | (1.2)
Foreign currency translation | ​ |  | 26.2 | ​ |  | 9.9
Balance — December 31, 2020 | ​ | $ | 1,928.4 | ​ | $ | 563.4
​ ​ Following is a summary of the changes in the carrying amount of goodwill by reportable segment during the years ended December 31, 2020, and 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Retail | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Retail | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Automotive |  | Truck |  | Other |  | Total
Balance — December 31, 2018 | ​ | $ | 1,511.9 | ​ | $ | 162.6 | ​ | $ | 77.5 | ​ | $ | 1,752.0
Additions | ​ |  | 0.9 | ​ | ​ | 145.6 | ​ | ​ | 0.1 | ​ |  | 146.6
Disposals | ​ | ​ | (3.9) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3.9)
Foreign currency translation | ​ |  | 15.9 | ​ |  | 0.8 | ​ |  | (0.4) | ​ |  | 16.3
Balance — December 31, 2019 | ​ | $ | 1,524.8 | ​ | $ | 309.0 | ​ | $ | 77.2 | ​ | $ | 1,911.0
Additions | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ |  | —
Disposals | ​ | ​ | (8.8) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (8.8)
Foreign currency translation | ​ |  | 18.8 | ​ |  | 0.4 | ​ |  | 7.0 | ​ |  | 26.2
Balance — December 31, 2020 | ​ | $ | 1,534.8 | ​ | $ | 309.4 | ​ | $ | 84.2 | ​ | $ | 1,928.4
​ There is no goodwill recorded in our Non-Automotive Investments reportable segment. We test for impairment of our intangible assets at least annually. During 2020 and 2019, we recorded $1.2 million and $1.9 million, respectively, of impairment charges relating to our intangible assets with respect to the sale or closure of certain franchised dealerships.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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