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Interim Financial Statements - Business Overview (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 07, 2017 USD ($) | Jul. 26, 2016 | Mar. 31, 2018 USD ($) item | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Interim Financial Statements |  |  |  |  |
Total revenues | $ |  |  | $ 5,746.9 | $ 5,081.1 |
PTL |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Ownership acquired (as a percent) | 5.50% |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 23.40% | 28.90% |  |
Cost of acquisition | $ | $ 239.1 |  |  |  |
Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total number of owned and operated franchises |  |  | 342 |  |
Number of owned and operated franchises in US |  |  | 151 |  |
Number of owned and operated franchises outside US |  |  | 191 |  |
Minimum number of vehicles retailed and wholesaled |  |  | 162,000 |  |
Minimum number of vehicle brands offered |  |  | 40 |  |
Number of stand-alone used vehicle dealerships operated in the U.S. and U.K. |  |  | 14 |  |
Number of acquired franchises |  |  | 4 |  |
Number of franchises disposed |  |  | 5 |  |
Commercial Vehicle Distribution |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Minimum number of dealership locations |  |  | 70 |  |
Number of retail dealerships owned by the reporting entity |  |  | 8 |  |
Italy | Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Number of acquired franchises |  |  | 4 |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 52.00% |  |
Automotive dealership revenues | Geographic | Outside the U.S. |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 48.00% |  |
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 |  |  | 20 |  |
Number of full service retail locations operated |  |  | 14 |  |
Number of collision centers operated |  |  | 6 |  |
Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ |  |  | $ 5,296.0 | 4,756.4 | $ 19,800.0
Retail Commercial Truck Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ |  |  | 292.4 | 211.7 |
Commercial Vehicle Distribution and Other |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ |  |  | $ 158.5 | $ 113.0 |

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