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Organization and Summary of Significant Accounting Policies - Prop and Equip, Contracts, Impairment, Investments (Details) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 22, 2017 | Sep. 07, 2017 | Sep. 06, 2017 | Sep. 30, 2017 | Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2018 USD ($) item | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Contracts in Transit |  |  |  |  |  |  |  |  |  |  |
Contracts in transit, included in accounts receivable |  |  |  |  |  |  | $ 314.2 |  |  | $ 356.1 |
Income Taxes |  |  |  |  |  |  |  |  |  |  |
Corporate tax rate (as a percent) | 35.00% |  |  |  |  |  | 21.00% | 21.00% | 35.00% |  |
Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  |  |  | 4 |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,752.0 |  |  | 1,660.5 | $ 1,291.2
Investments |  |  |  |  |  |  |  |  |  |  |
Net book value of investments |  |  |  |  |  |  | 1,305.2 |  |  | 1,256.6 |
PTL |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |
Net book value of investments |  |  |  |  |  |  | $ 1,237.4 |  |  | 1,185.6 |
PTL |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Minimum | Property and equipment other than leasehold improvements |  |  |  |  |  |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |  |  |  |  |  |
Useful life of property and equipment |  |  |  |  |  |  | 3 years |  |  |  |
Maximum | Property and equipment other than leasehold improvements |  |  |  |  |  |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |  |  |  |  |  |
Useful life of property and equipment |  |  |  |  |  |  | 15 years |  |  |  |
Maximum | Leasehold improvements and equipment under capital lease |  |  |  |  |  |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |  |  |  |  |  |
Useful life of property and equipment |  |  |  |  |  |  | 40 years |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  |  |  | 1 |  |  |  |
Number of operating segments and reporting units for the purpose of goodwill impairment testing | item |  |  |  |  |  |  | 6 |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,511.9 |  |  | 1,412.1 | 1,050.2
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |
Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Number of operating segments and reporting units for the purpose of goodwill impairment testing | item |  |  |  |  |  |  | 1 |  |  |  |
Goodwill |  |  |  |  |  |  | $ 162.6 |  |  | 163.0 | $ 162.0
Non-Automotive Investments |  |  |  |  |  |  |  |  |  |  |
Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 0.0 |  |  | $ 0.0 |

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