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Interim Financial Statements - Business Overview (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2022 dealership | Feb. 28, 2022 dealership | Mar. 31, 2022 USD ($) dealership franchise location vehicle | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2022 USD ($) | Dec. 31, 2020 USD ($)
Interim Financial Statements |  |  |  |  |  |  |
Total revenues |  |  | $ 6,975.4 | $ 5,773.8 |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 |  |  | 4,164.4 | 3,484.7 | $ 4,095.0 |  | $ 3,326.1
Retained Earnings |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
After-tax cumulative effect adjustment to retained earnings after adoption of Topic 842 |  |  | $ 4,336.9 | 3,299.2 | 4,196.6 |  | $ 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) |  |
Retail Automotive Franchise |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of franchises disposed | franchise |  |  | 0 |  |  |  |
PTL |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 28.90% |  |  |  |
Number of vehicles in fleet | vehicle |  |  | 373,000 |  |  |  |
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 |  |  | 137,000 |  |  |  |
Minimum number of vehicle brands offered | vehicle |  |  | 35 |  |  |  |
Revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 55.00% |  |  |  |
Revenues | Geographic | Outside the U.S. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 45.00% |  |  |  |
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 |  |  | $ 6,029.2 | 5,206.9 | $ 22,500.0 |  |
Retail automotive dealership | Retail Automotive |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total number of owned and operated franchises | franchise |  |  | 321 |  |  |  |
Number of owned and operated franchises in US | franchise |  |  | 147 |  |  |  |
Number of owned and operated franchises outside US | franchise |  |  | 174 |  |  |  |
Number of stand-alone used vehicle dealerships operated in United States and United Kingdom | dealership |  |  | 23 |  |  |  |
Retail automotive dealership | U.S. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues |  |  | $ 3,343.6 | 3,004.8 |  |  |
Number of franchises awarded to the reporting entity | franchise |  |  | 1 |  |  |  |
Number of acquired franchises | franchise |  |  | 1 |  |  |  |
Retail automotive dealership | U.K. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues |  |  | $ 2,262.9 | 1,853.4 |  |  |
Retail automotive dealership | U.K. | BMW Mini | Subsequent Event |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of locations acquired | dealership | 3 |  |  |  |  |  |
Retail automotive dealership | U.K. | Mercedes Benz |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of dealerships to be transitioned | dealership |  |  | 14 |  |  |  |
Retail automotive dealership | Revenues | Premium brands |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 70.00% |  |  |  |
Retail automotive dealership | CarShop | U.S. | Retail Automotive |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of retail locations operated | dealership |  |  | 8 |  |  |  |
Retail automotive dealership | CarShop | U.K. | Retail Automotive |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of retail locations operated | dealership |  |  | 15 |  |  |  |
Retail commercial truck dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues |  |  | $ 792.3 | $ 434.7 |  |  |
Retail commercial truck dealership | TEAM Truck Centres |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of full service dealerships added | dealership |  | 4 |  |  |  |  |
Retail commercial truck dealership | PTG | Retail Commercial Truck Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of operating locations | location |  |  | 41 |  |  |  |

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