Revenues - Other Disclosures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues
Total revenues	$ 7,339.0	$ 6,975.4
Commercial vehicle distribution and other
Revenues
Total revenues	$ 143.6	153.9
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	$ 39.7		$ 38.4
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	$ 61.3	$ 55.1