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Organization and Summary of Significant Accounting Policies (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 01, 2016 item | Sep. 30, 2015 | Feb. 28, 2015 item | Dec. 31, 2015 USD ($) item | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Oct. 31, 2014
Organization and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables from manufacturers | $ |  |  |  | $ 178.9 |  |  |  | $ 172.0 |  |  |  | $ 178.9 | $ 172.0 |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  | $ 4,921.3 | $ 4,960.1 | $ 4,920.6 | $ 4,482.9 | $ 4,425.6 | $ 4,396.7 | $ 4,384.5 | $ 4,025.2 | $ 19,284.9 | 17,232.0 | $ 14,482.5 |
German Automotive Dealership Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |
Ownership acquired (as a percentage) |  | 10.00% |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Ownership interest (as a percent) |  |  |  | 60.00% |  |  |  |  |  |  |  | 60.00% |  |  |
Penske Truck Leasing Co., L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises |  |  |  | 355 |  |  |  |  |  |  |  | 355 |  |  |
Number of owned and operated franchises in US |  |  |  | 181 |  |  |  |  |  |  |  | 181 |  |  |
Number of owned and operated franchises outside US |  |  |  | 174 |  |  |  |  |  |  |  | 174 |  |  |
Number of acquired franchises |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Number of franchises awarded to the reporting entity |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of franchises disposed of |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Retail Commercial Truck Dealership | PTG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership acquired (as a percentage) |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Number of operating franchises | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  | 96.00% |  |  |  |  |  |  |  | 96.00% |  |  |
Number of full service retail locations operated | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of full service retail locations acquired |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of Equity Method Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32.00%
Commercial Vehicle Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of dealership locations |  |  |  |  |  |  |  |  |  |  |  | 70 |  |  |
Number of retail dealerships owned by the reporting entity |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
BMW/Mini | Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  | 27.00% |  |  |
Audi/Volkswagen/Porsche/Bentley | Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  | 22.00% |  |  |
Toyota/Lexus/Scion | Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Mercedes-Benz/Sprinter/smart | Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  | $ 17,896.3 | 16,657.5 | 14,329.9 |
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  | 944.1 | 125.6 |  |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  | $ 444.5 | $ 448.9 | $ 152.6 |

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