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Organization and Summary of Significant Accounting Policies - Prop and Equip, Contracts, Impairment, Investments (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) segment reporting | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Contracts in Transit |  |  |
Accounts receivable | $ 734,000,000.0 | $ 806,900,000 |
Impairment Testing |  |  |
Number of reportable segments | segment | 4 |  |
Goodwill | $ 2,124,100,000 | 1,928,400,000 | $ 1,911,000,000
Investments |  |  |
Net book value of investments | 1,688,100,000 | 1,500,300,000 |
Contracts in transit |  |  |
Contracts in Transit |  |  |
Accounts receivable | 198,700,000 | 254,000,000.0 |
PTL |  |  |
Investments |  |  |
Net book value of investments | $ 1,643,100,000 | 1,419,200,000 |
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 | segment | 1 |  |
Number of operating segments | reporting | 6 |  |
Goodwill | $ 1,622,200,000 | 1,534,800,000 | 1,524,800,000
Retail commercial truck dealership |  |  |
Impairment Testing |  |  |
Number of operating segments and reporting units for the purpose of goodwill impairment testing | segment | 1 |  |
Goodwill | $ 422,300,000 | 309,400,000 | $ 309,000,000.0
Non-Automotive Investments |  |  |
Impairment Testing |  |  |
Goodwill | $ 0 | $ 0 |

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