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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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Jun. 30, 2018 item | Sep. 07, 2017 | Sep. 06, 2017 | Apr. 30, 2018 item | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Interim Financial Statements |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  | $ 5,940.3 | $ 5,383.4 | $ 11,687.2 | $ 10,464.5 |
PTL |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |
Ownership acquired (as a percent) |  | 5.50% |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 28.90% |  | 23.40% |  |  |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises | 341 |  |  |  | 341 |  | 341 |  |
Number of owned and operated franchises in US | 151 |  |  |  | 151 |  | 151 |  |
Number of owned and operated franchises outside US | 190 |  |  |  | 190 |  | 190 |  |
Minimum number of vehicles retailed and wholesaled |  |  |  |  |  |  | 330,000 |  |
Minimum number of vehicle brands offered |  |  |  |  |  |  | 40 |  |
Number of stand-alone used vehicle dealerships operated in the U.S. and U.K. | 14 |  |  |  | 14 |  | 14 |  |
Number of acquired franchises |  |  |  |  |  |  | 4 |  |
Number of franchises disposed |  |  |  |  |  |  | 6 |  |
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) |  |  |  |  |  |  | 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 |  |  |  |  |  |  | 21 |  |
Number of full service retail locations operated |  |  |  |  |  |  | 15 |  |
Number of collision centers operated |  |  |  |  |  |  | 6 |  |
Number of locations acquired |  |  |  | 1 |  |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  | $ 5,455.5 | 5,040.7 | $ 10,751.5 | 9,797.1 | $ 19,800.0
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  | 338.8 | 228.5 | 631.2 | 440.2 |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  | $ 146.0 | $ 114.2 | $ 304.5 | $ 227.2 |

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