Revenues - Other Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenues
Total revenues	$ 6,906.9	$ 6,987.5	$ 13,882.3	$ 12,761.3
Commercial vehicle distribution and other
Revenues
Total revenues	140.9	164.6	$ 294.8	296.8
Vehicle Sales | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period			30 days
Service and parts | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period			30 days
Finance and insurance, net | Retail Automotive and Retail Commercial Truck Dealership
Revenues
Payment period			30 days
Aggregate reserves relating to chargeback activity	36.1		$ 36.1		$ 33.7
Penske Australia | Commercial vehicle distribution and other
Revenues
Payment period			30 days
Penske Australia | Service and parts | Commercial vehicle distribution and other
Revenues
Total revenues	$ 60.5	$ 72.0	$ 115.6	$ 140.0