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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventories |
Inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2020 |  | 2019 |
Retail automotive dealership new vehicles | ​ | $ | 1,810.9 | ​ | $ | 2,346.2 | ​
Retail automotive dealership used vehicles | ​ |  | 1,019.7 | ​ |  | 1,080.8 | ​
Retail automotive parts, accessories, and other | ​ |  | 117.2 | ​ |  | 141.5 | ​
Retail commercial truck dealership vehicles and parts | ​ | ​ | 223.1 | ​ | ​ | 465.2 | ​
Commercial vehicle distribution vehicles, parts, and engines | ​ |  | 254.7 | ​ |  | 227.0 | ​
Total inventories | ​ | $ | 3,425.6 | ​ | $ | 4,260.7 | ​

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