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Interim Financial Statements - Business Overview (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2021 location | Sep. 30, 2021 item location | Apr. 30, 2021 item | Sep. 30, 2021 USD ($) item location | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) item location | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Interim Financial Statements |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | $ 6,497,300,000 | $ 5,971,600,000 | $ 19,258,600,000 | $ 14,631,800,000 |
Number of acquired franchises |  |  |  |  |  | 1 |  |
PTL |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  | 28.90% |  |
KCFL |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of full service dealerships added |  |  |  |  |  | 4 |  |
Number of parts and service centers added |  |  |  |  |  | 4 |  |
Number of collision centers added |  |  |  |  |  | 2 |  |
Retail Automotive |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Total number of owned and operated franchises |  | 305 |  | 305 |  | 305 |  |
Number of owned and operated franchises in US |  | 144 |  | 144 |  | 144 |  |
Number of owned and operated franchises outside US |  | 161 |  | 161 |  | 161 |  |
Minimum number of vehicles retailed and wholesaled |  |  |  |  |  | 433,000 |  |
Minimum number of vehicle brands offered |  |  |  |  |  | 35 |  |
Retail Automotive | CarShop |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of locations acquired | location | 2 |  |  |  |  |  |  |
Retail Automotive | Nicole Group |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Ownership acquired (as a percent) | 51.00% |  |  |  |  |  |  |
UK | Retail Automotive |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of franchises disposed | $ |  |  |  |  |  | 1 |  |
UK | Retail Automotive | CarShop |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of used vehicle supercenters operated in the U.K. | location |  | 13 |  | 13 |  | 13 |  |
Number of locations acquired | location | 1 |  |  |  |  |  |  |
U.S. | Retail Automotive |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of acquired franchises | $ |  |  |  |  |  | 1 |  |
Number of franchises awarded to the reporting entity | $ |  |  |  |  |  | 1 |  |
U.S. | Retail Automotive | CarShop |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of used vehicle supercenters operated in the U.S. | location |  | 7 |  | 7 |  | 7 |  |
Number of locations acquired | location | 1 | 1 |  |  |  |  |  |
Revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  |  | 58.00% |  |
Revenues | Geographic | Outside the U.S. |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  |  | 42.00% |  |
PTL |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of vehicles managed in fleet, minimum |  |  |  |  |  | 350,000 |  |
Penske Corporation | PTL |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  | 41.10% |  |
Mitsui and Co | PTL |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  | 30.00% |  |
PTG | Retail Commercial Truck Dealership |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of operating locations | location |  |  |  |  |  | 35 |  |
Retail automotive dealership |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | $ 5,634,900,000 | 5,258,000,000.0 | $ 17,039,400,000 | 12,828,100,000 | $ 17,900,000,000
Retail automotive dealership | UK |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | 2,055,200,000 | 2,105,500,000 | 6,099,200,000 | 4,608,700,000 |
Retail automotive dealership | U.S. |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | 3,271,200,000 | 2,780,700,000 | $ 9,890,500,000 | 7,288,400,000 |
Retail automotive dealership | Revenues | Premium brands |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  |  | 70.00% |  |
Retail commercial truck dealership |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | 717,300,000 | 590,900,000 | $ 1,777,300,000 | 1,481,500,000 |
Retail commercial truck dealership | KCFL |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Number of full service dealerships added |  |  | 4 |  |  |  |  |
Number of parts and service centers added |  |  | 4 |  |  |  |  |
Number of collision centers added |  |  | 2 |  |  |  |  |
Commercial vehicle distribution |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | $ 145,100,000 | $ 122,700,000 | $ 441,900,000 | $ 322,200,000 |

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