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Interim Financial Statements - Business Overview (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 item | Jul. 27, 2016 USD ($) | Jul. 26, 2016 | Dec. 31, 2016 item | Apr. 30, 2016 item | Jun. 30, 2017 USD ($) item | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) item | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | $ 5,383.4 | $ 5,254.1 | $ 10,464.5 | $ 10,078.7 |
PTL |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Ownership acquired (as a percent) |  | 14.40% |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 23.40% |  | 9.00% |  |  |  |  |  |  |
Cost of acquisition | $ |  | $ 498.5 |  |  |  |  |  |  |  |
CarSense |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  | 5 |  |
CarShop |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  | 5 |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises | 354 |  |  |  |  | 354 |  | 354 |  |
Number of owned and operated franchises in US | 162 |  |  |  |  | 162 |  | 162 |  |
Number of owned and operated franchises outside US | 192 |  |  |  |  | 192 |  | 192 |  |
Minimum number of vehicles retailed and wholesaled |  |  |  |  |  |  |  | 315,200 |  |
Minimum number of vehicle brands offered |  |  |  |  |  |  |  | 40 |  |
Number of acquired franchises |  |  |  |  |  |  |  | 6 |  |
Number of franchises awarded to the reporting entity |  |  |  |  |  |  |  | 2 |  |
Number of franchises disposed |  |  |  |  |  |  |  | 9 |  |
Number of smart franchises disposed |  |  |  |  |  |  |  | 5 |  |
Retail Automotive Dealership | CarSense |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  | 5 |  |
Retail Automotive Dealership | CarShop |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  | 5 |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of operating locations |  |  |  |  |  |  |  | 20 |  |
Number of full service retail locations operated |  |  |  |  |  |  |  | 14 |  |
Number of retail locations acquired |  |  |  | 2 | 4 |  |  |  |  |
Commercial Vehicle Distribution |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Minimum number of dealership locations |  |  |  |  |  |  |  | 70 |  |
Number of retail dealerships owned by the reporting entity |  |  |  |  |  |  |  | 10 |  |
New Jersey | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  | 2 |  |
Arizona | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  | 2 |  |
Germany | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  | 2 |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  |  |  |  | 58.00% |  |
Automotive dealership revenues | Geographic | Outside the U.S. |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  |  |  |  | 42.00% |  |
Automotive dealership revenues | Premium brands |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  |  |  |  | 70.00% |  |
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) | 20.00% |  |  |  |  |  |  |  |  |
GEC | PTL |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 15.50% |  |  |  |  |  |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | $ 5,040.7 | 4,836.8 | $ 9,797.1 | 9,349.7 | $ 18,700.0
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | 228.5 | 309.5 | 440.2 | 516.2 |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | $ 114.2 | $ 107.8 | $ 227.2 | $ 212.8 |

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