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Organization and Summary of Significant Accounting Policies - Prop and Equip, Contracts, Impairment, Investments (Details) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 22, 2017 | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Contracts in Transit |  |  |  |  |
Contracts in transit, included in accounts receivable |  |  | $ 254.0 | $ 291.1 |
Income Taxes |  |  |  |  |
Corporate tax rate (as a percent) | 21.00% | 35.00% |  |  |
Impairment Testing |  |  |  |  |
Number of reportable segments | item |  |  | 4 |  |
Goodwill |  |  | $ 1,928.4 | 1,911.0 | $ 1,752.0
Investments |  |  |  |  |
Net book value of investments |  |  | 1,500.3 | 1,399.0 |
PTL |  |  |  |  |
Investments |  |  |  |  |
Net book value of investments |  |  | $ 1,419.2 | 1,323.2 |
PTL |  |  |  |  |
Investments |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 28.90% |  |
Leasehold improvements and equipment under capital lease |  |  |  |  |
Property and Equipment |  |  |  |  |
Useful life of property and equipment |  |  | 40 years |  |
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 |  |
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 |  |  | $ 1,534.8 | 1,524.8 | 1,511.9
Retail Commercial Truck Dealership |  |  |  |  |
Impairment Testing |  |  |  |  |
Number of operating segments and reporting units for the purpose of goodwill impairment testing | item |  |  | 1 |  |
Goodwill |  |  | $ 309.4 | 309.0 | $ 162.6
Non-Automotive Investments |  |  |  |  |
Impairment Testing |  |  |  |  |
Goodwill |  |  | $ 0.0 | $ 0.0 |

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