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Organization and Summary of Significant Accounting Policies - Business Overview (Details) vehicle in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Apr. 30, 2021 dealership | Dec. 31, 2021 USD ($) franchise location dealership vehicle | Dec. 31, 2020 USD ($)
Significant Accounting Policies |  |  |  |
Accounts receivable | $ |  |  | $ 734.0 | $ 806.9
PTL |  |  |  |
Significant Accounting Policies |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 28.90% |
Number of vehicles in fleet | vehicle |  |  | 360 |
Penske Corporation | PTL |  |  |  |
Significant Accounting Policies |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 41.10% |
Mitsui and Co | PTL |  |  |  |
Significant Accounting Policies |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 30.00% |
Retail automotive dealership | Manufacturer receivables |  |  |  |
Significant Accounting Policies |  |  |  |
Accounts receivable | $ |  |  | $ 157.7 | $ 193.6
Retail automotive dealership | U.S. |  |  |  |
Significant Accounting Policies |  |  |  |
Number of franchises acquired | franchise |  |  | 3 |
Number of franchises awarded to reporting entity | franchise |  |  | 1 |
Retail automotive dealership | U.K. |  |  |  |
Significant Accounting Policies |  |  |  |
Number of franchises awarded to reporting entity | franchise |  |  | 1 |
Number of franchises disposed | franchise |  |  | 1 |
Retail automotive dealership | Retail Automotive Dealership |  |  |  |
Significant Accounting Policies |  |  |  |
Number of owned and operated franchises | franchise |  |  | 320 |
Number of owned and operated franchises in US | franchise |  |  | 146 |
Number of owned and operated franchises outside US | franchise |  |  | 174 |
Number of used vehicle supercenters operated in the U.S. and U.K. |  |  | 23 |
Retail automotive dealership | Retail Automotive Dealership | Nicole Group |  |  |  |
Significant Accounting Policies |  |  |  |
Ownership percentage acquired | 51.00% |  |  |
Retail automotive dealership | Retail Automotive Dealership | CarShop |  |  |  |
Significant Accounting Policies |  |  |  |
Increase in number of dealership locations, percent |  |  | 35.00% |
Retail automotive dealership | Retail Automotive Dealership | CarShop | U.S. |  |  |  |
Significant Accounting Policies |  |  |  |
Number of retail locations operated |  |  | 8 |
Number of dealerships opened |  |  | 2 |
Retail automotive dealership | Retail Automotive Dealership | CarShop | U.K. |  |  |  |
Significant Accounting Policies |  |  |  |
Number of retail locations operated |  |  | 15 |
Number of dealerships opened |  |  | 4 |
Retail automotive dealership | Audi/Volkswagen/Porsche/Bentley | Automotive dealership revenues | Customer Concentration Risk |  |  |  |
Significant Accounting Policies |  |  |  |
Percentage of total |  |  | 22.00% |
Retail automotive dealership | BMW, MINI | Automotive dealership revenues | Customer Concentration Risk |  |  |  |
Significant Accounting Policies |  |  |  |
Percentage of total |  |  | 24.00% |
Retail automotive dealership | Toyota/Lexus | Automotive dealership revenues | Customer Concentration Risk |  |  |  |
Significant Accounting Policies |  |  |  |
Percentage of total |  |  | 14.00% |
Retail commercial truck dealership | Retail Commercial Truck Dealership | PTG |  |  |  |
Significant Accounting Policies |  |  |  |
Number of operating locations | location |  |  | 37 |
Retail commercial truck dealership | Retail Commercial Truck Dealership | PTG | Kansas City Freightliner |  |  |  |
Significant Accounting Policies |  |  |  |
Number of full service dealerships added |  | 4 | 4 |
Number of parts and service centers added |  | 4 | 4 |
Number of collision centers added |  | 2 | 2 |
Retail commercial truck dealership | Retail Commercial Truck Dealership | PTG | McCoy Freightliner |  |  |  |
Significant Accounting Policies |  |  |  |
Number of full service dealerships added |  | 2 | 2 |

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