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Organization and Summary of Significant Accounting Policies - Business Overview (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 07, 2017 | Sep. 06, 2017 | Apr. 30, 2018 item | Sep. 30, 2017 | Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2018 USD ($) item | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($)
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  | $ 5,439.3 | $ 5,658.6 | $ 5,940.3 | $ 5,746.9 | $ 5,398.0 | $ 5,524.4 | $ 5,383.4 | $ 5,081.1 | $ 22,785.1 | $ 21,386.9 | $ 20,118.5
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Receivables from manufacturers | $ |  |  |  |  |  |  | $ 211.3 |  |  |  | $ 230.1 |  |  |  | $ 211.3 | $ 230.1 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  | 20.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  | 50.00% |  |
German Automotive Dealership Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership acquired (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.40% |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 79.40% |  |  |  |  |  |  |  | 79.40% |  |
PTL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 23.40% |  |  | 23.40% | 9.00% |  |  |  |  |  |  |  |  | 28.90% |  |
Ownership acquired (as a percent) | 5.50% |  |  | 5.50% | 14.40% |  |  |  |  |  |  |  |  |  |  |  |
CarSense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
CarShop |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
The Car People |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail locations acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
CarShop and the The Car People |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Penske Corporation | PTL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41.10% |  |
Mitsui and Co | PTL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |
Ownership acquired (as a percent) | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of owned and operated franchises |  |  |  |  |  |  | 345 |  |  |  |  |  |  |  | 345 |  |
Number of owned and operated franchises in US |  |  |  |  |  |  | 154 |  |  |  |  |  |  |  | 154 |  |
Number of owned and operated franchises outside US |  |  |  |  |  |  | 191 |  |  |  |  |  |  |  | 191 |  |
Number of acquired franchises |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Number of franchises awarded to the reporting entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of franchises disposed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Number of stand-alone used vehicle dealerships operated in the U.S. and U.K. |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  | 14 |  |
Retail Automotive Dealership | CarSense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail locations operated |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Retail Automotive Dealership | CarShop |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail locations operated |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Retail Automotive Dealership | The Car People |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail locations operated |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Retail Commercial Truck Dealership | PTG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating franchises |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |
Number of operating locations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |
Number of locations acquired |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Vehicle Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of dealership locations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |
Number of retail dealerships owned by the reporting entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |
BMW, MINI | Automotive dealership revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23.00% |  |
Audi/Volkswagen/Porsche/Bentley | Automotive dealership revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.00% |  |
Toyota/Lexus | Automotive dealership revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.00% |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,849.2 | $ 19,824.3 | 18,673.2
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,374.5 | 1,048.0 | 1,000.7
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 561.4 | 514.6 | 444.6
Italy | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Texas | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired franchises |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
UK | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises disposed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
UK | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,961.4 |  |
U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,607.8 | $ 12,487.2 | $ 12,005.9
U.S. | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises disposed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
U.S. | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,504.3 |  |

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