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Interim Financial Statements - Business Overview (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2016 USD ($) item | Jul. 01, 2016 item | Jun. 30, 2016 item | Apr. 30, 2016 item | Feb. 28, 2015 item | Jun. 30, 2016 USD ($) item | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) item | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2016 | Oct. 31, 2014
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | $ 5,254.1 | $ 4,920.6 | $ 10,078.7 | $ 9,403.5 |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 23.40% |  |  |  |  |  |  |  |  |  |  |
German Automotive Dealership Group |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  |  |  |  |  | 8.00% |  |  |  |
Ownership interest (as a percent) |  |  | 68.00% |  |  | 68.00% |  | 68.00% |  |  |  |
Nicole Group | BMW Dealership |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of dealerships operated |  |  |  |  |  |  |  | 4 |  |  |  |
Nicole Group | MINI Dealership |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of dealerships operated |  |  |  |  |  |  |  | 3 |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises |  |  | 352 |  |  | 352 |  | 352 |  |  |  |
Number of owned and operated franchises in US |  |  | 180 |  |  | 180 |  | 180 |  |  |  |
Number of owned and operated franchises outside US |  |  | 172 |  |  | 172 |  | 172 |  |  |  |
Minimum number of vehicles retailed and wholesaled |  |  |  |  |  |  |  | 273,000 |  |  |  |
Minimum number of vehicle brands offered |  |  |  |  |  |  |  | 40 |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  | 1 |  |  |  |
Number of franchises disposed |  |  |  |  |  |  |  | 8 |  |  |  |
Number of franchises awarded to the reporting entity |  |  |  |  |  |  |  | 4 |  |  |  |
Retail Automotive Dealership | Nicole Group |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  |  |  | 49.00% |
Retail Automotive Dealership | Dealer Group in UK | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 12 |  |  |  |  |  |  |  |  |  |
Retail Automotive Dealership | Dealer Group in UK | BMW Dealership | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 1 |  |  |  |  |  |  |  |  |  |
Retail Automotive Dealership | Dealer Group in UK | MINI Dealership | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 1 |  |  |  |  |  |  |  |  |  |
Retail Automotive Dealership | Dealer Group in UK | Volkswagen Dealership | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 7 |  |  |  |  |  |  |  |  |  |
Retail Automotive Dealership | Dealer Group in UK | Audi Dealership | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  | 1 |  |  |  |  |  |  |  |  |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Number of operating locations |  |  |  |  |  |  |  | 19 |  |  |  |
Number of full service retail locations operated |  |  | 14 |  |  | 14 |  | 14 |  |  |  |
Number of retail locations acquired |  |  |  | 5 | 2 |  |  |  |  |  |  |
Retail Commercial Truck Dealership | PTG |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 100.00% |  |  | 100.00% |  | 100.00% |  | 96.00% |  |
Ownership acquired (as a percent) |  |  |  |  |  |  |  |  |  | 5.00% |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  |  |  |  | 32.00%
Commercial Vehicle Distribution |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of dealership locations |  |  |  |  |  |  |  | 70 |  |  |  |
Number of commercial vehicle dealerships |  |  |  |  |  |  |  | 3 |  |  |  |
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) |  |  |  |  |  |  |  | 72.00% |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | $ 4,836.8 | 4,554.9 | $ 9,349.7 | 8,741.7 | $ 17,900.0 |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | 309.5 | 241.9 | 516.2 | 434.6 |  |  |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  | $ 107.8 | $ 123.8 | $ 212.8 | $ 227.2 |  |  |
Penske Truck Leasing Co., L.P. | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) | 14.40% |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 23.40% |  |  |  |  |  |  |  |  |  |  |
Cost of acquisition | $ | $ 498.7 |  |  |  |  |  |  |  |  |  |  |
Number of vehicles operated and maintained | 238,000 |  |  |  |  |  |  |  |  |  |  |
Penske Truck Leasing Co., L.P. | PTL |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 9.00% |  |  |  |  |  |  |  |  |
Penske Corporation | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 41.10% |  |  |  |  |  |  |  |  |  |  |
Mitsui and Co | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 20.00% |  |  |  |  |  |  |  |  |  |  |
GE Capital | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) | 15.50% |  |  |  |  |  |  |  |  |  |  |

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