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Interim Financial Statements - Business Overview (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) item | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Interim Financial Statements |  |  |
Total revenues | $ | $ 5,564.4 | $ 5,746.9 |
Number of used vehicle supercenters operated in the U.S. and U.K. | 14 |  |
PTL |  |  |
Interim Financial Statements |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 28.90% |  |
German Automotive Dealership Group |  |  |
Interim Financial Statements |  |  |
Ownership acquired (as a percent) | 8.40% |  |
Ownership interest (as a percent) | 87.80% |  |
Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Total number of owned and operated franchises | 339 |  |
Number of owned and operated franchises in US | 149 |  |
Number of owned and operated franchises outside US | 190 |  |
Minimum number of vehicles retailed and wholesaled | 157,000 |  |
Minimum number of vehicle brands offered | 40 |  |
Number of franchises disposed | 7 |  |
Commercial Vehicle Distribution |  |  |
Interim Financial Statements |  |  |
Minimum number of dealership locations | 70 |  |
Number of retail dealerships owned by the reporting entity | 10 |  |
U.S. | Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Number of franchises disposed | 6 |  |
Germany | Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Number of franchises disposed | 1 |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico |  |  |
Interim Financial Statements |  |  |
Automotive dealership revenue (as a percent) | 53.00% |  |
Automotive dealership revenues | Geographic | Outside the U.S. |  |  |
Interim Financial Statements |  |  |
Automotive dealership revenue (as a percent) | 47.00% |  |
Automotive dealership revenues | Premium brands |  |  |
Interim Financial Statements |  |  |
Automotive dealership revenue (as a percent) | 70.00% |  |
CarSense | Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Number of retail locations operated | 5 |  |
CarShop | Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Number of retail locations operated | 5 |  |
The Car People | Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Number of retail locations operated | 4 |  |
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 | 19 |  |
Retail Automotive Dealership |  |  |
Interim Financial Statements |  |  |
Total revenues | $ | $ 5,091.2 | 5,296.0 | $ 20,800.0
Retail Automotive Dealership | U.S. |  |  |
Interim Financial Statements |  |  |
Total revenues | $ | 2,722.8 | 2,750.9 |
Retail Commercial Truck Dealership |  |  |
Interim Financial Statements |  |  |
Total revenues | $ | 332.3 | 292.4 |
Commercial Vehicle Distribution and Other |  |  |
Interim Financial Statements |  |  |
Total revenues | $ | $ 140.9 | $ 158.5 |

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