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Interim Financial Statements - Business Overview (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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Feb. 28, 2022 dealership | Sep. 30, 2022 franchise | Jun. 30, 2022 USD ($) franchise dealership vehicle location | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) franchise dealership vehicle location | Jun. 30, 2021 USD ($) franchise | Dec. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) location | Jan. 01, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 6,906.9 | $ 6,987.5 | $ 13,882.3 | $ 12,761.3 |  |  |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 | $ |  |  | 4,219.4 | 3,762.7 | 4,219.4 | 3,762.7 | $ 4,095.0 | $ 4,164.4 |  | $ 3,484.7 | $ 3,326.1
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 | $ |  |  | $ 4,506.7 | 3,602.5 | $ 4,506.7 | 3,602.5 | 4,196.6 | $ 4,336.9 |  | $ 3,299.2 | $ 3,151.3
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 | $ |  |  |  |  |  |  | (121.6) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 | $ |  |  |  |  |  |  | (121.6) |  |  |  |
PTL |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  | 28.90% |  |  |  |  |  |
Number of vehicles in fleet | vehicle |  |  | 386,000 |  | 386,000 |  |  |  |  |  |
PTL | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 | $ |  |  |  |  |  |  |  |  | $ 121.6 |  |
Retail Automotive |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Minimum number of vehicles retailed and wholesaled | vehicle |  |  |  |  | 276,000 |  |  |  |  |  |
Minimum number of vehicle brands offered | vehicle |  |  |  |  | 35 |  |  |  |  |  |
Revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  | 56.00% |  |  |  |  |  |
Revenues | Geographic | Outside the U.S. |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  | 44.00% |  |  |  |  |  |
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% |  |  |  |  |  |
Retail automotive dealership |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 5,997.3 | 6,197.6 | $ 12,026.5 | 11,404.5 | $ 22,500.0 |  |  |  |
Retail automotive dealership | Retail Automotive |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises |  |  | 332 |  | 332 |  |  |  |  |  |
Number of owned and operated franchises in US |  |  | 152 |  | 152 |  |  |  |  |  |
Number of owned and operated franchises outside US |  |  | 180 |  | 180 |  |  |  |  |  |
Number of stand-alone used vehicle dealerships operated in United States and United Kingdom | dealership |  |  | 21 |  | 21 |  |  |  |  |  |
Retail automotive dealership | Mercedes Benz | Forecast |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 5 |  |  |  |  |  |  |  |  |
Retail automotive dealership | United States And United Kingdom | Retail Automotive |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  | 10 |  |  |  |  |  |
Retail automotive dealership | U.S. |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 3,443.9 | 3,614.5 | $ 6,787.5 | $ 6,619.3 |  |  |  |  |
Number of franchises awarded to the reporting entity |  |  |  |  |  | 1 |  |  |  |  |
Retail automotive dealership | U.S. | Retail Automotive |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of retail locations operated | dealership |  |  |  |  | 8 |  |  |  |  |  |
Number of acquired franchises |  |  |  |  | 4 |  |  |  |  |  |
Number of franchises awarded to the reporting entity |  |  |  |  | 2 |  |  |  |  |  |
Retail automotive dealership | U.K. |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 2,196.4 | 2,190.6 | $ 4,459.3 | $ 4,044.0 |  |  |  |  |
Retail automotive dealership | U.K. | Retail Automotive |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of retail locations operated | dealership |  |  |  |  | 13 |  |  |  |  |  |
Number of acquired franchises | dealership |  |  |  |  | 6 |  |  |  |  |  |
Number of retail locations disposed | dealership |  |  | 2 |  |  |  |  |  |  |  |
Retail automotive dealership | U.K. | Mercedes Benz | Forecast |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 3 |  |  |  |  |  |  |  |  |
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 | $ |  |  | $ 768.7 | $ 625.3 | $ 1,561.0 | $ 1,060.0 |  |  |  |  |
Retail commercial truck dealership | TEAM Truck Centres |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of full service dealerships added | dealership | 4 |  |  |  |  |  |  |  |  |  |
Retail commercial truck dealership | Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Minimum number of vehicles retailed and wholesaled |  |  |  |  | 9,100 |  |  |  |  |  |
Number of operating locations | location |  |  | 39 |  | 39 |  |  | 41 |  |  |
Number of franchises disposed |  |  | 2 |  |  |  |  |  |  |  |
Retail commercial truck dealership | United States And Ontario, Canada |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |
Number of dealerships | dealership |  |  | 9 |  | 9 |  |  |  |  |  |

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