Interim Financial Statements - Business Overview (Details) vehicle in Thousands, employee in Thousands, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 dealership franchise vehicle location center state	Jun. 30, 2023 USD ($) franchise vehicle dealership location state	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) franchise vehicle dealership brand location state employee	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Interim Financial Statements [Line Items]
Number of PAG employees | employee				27
Number of PTL employees | employee				43
Revenues | $		$ 7,468.5	$ 6,906.9	$ 14,807.5	$ 13,882.3
Minimum number of vehicle brands offered | brand				35
U.S. and Puerto Rico | Retail automotive dealership revenues | Geographic
Interim Financial Statements [Line Items]
Percentage of total				54.00%
Outside the U.S. | Retail automotive dealership revenues | Geographic
Interim Financial Statements [Line Items]
Percentage of total				46.00%
U.S.
Interim Financial Statements [Line Items]
Number of franchises disposed				4
Retail automotive dealership
Interim Financial Statements [Line Items]
Revenues | $		$ 6,406.0	5,997.3	$ 12,705.8	12,026.5	$ 23,700.0
Total number of owned and operated franchises	337	337		337
Retail automotive dealership | Retail automotive dealership revenues | Premium brands
Interim Financial Statements [Line Items]
Percentage of total				71.00%
Retail automotive dealership | Outside the U.S.
Interim Financial Statements [Line Items]
Number of owned and operated franchises outside US	189	189		189
Retail automotive dealership | U.S. and U.K.
Interim Financial Statements [Line Items]
Number of stand-alone used vehicle dealerships operated in United States and United Kingdom | dealership	20	20		20
Retail automotive dealership | U.S.
Interim Financial Statements [Line Items]
Revenues | $		$ 3,537.0	3,443.9	$ 6,915.2	6,787.5
Number of owned and operated franchises in US	148	148		148
Number of retail locations operated | dealership				7
Number of franchises disposed				3
Retail automotive dealership | U.K.
Interim Financial Statements [Line Items]
Revenues | $		$ 2,401.5	2,196.4	$ 4,873.9	4,459.3
Number of retail locations operated | dealership				13
CarShop Satellite | U.S.
Interim Financial Statements [Line Items]
Number of franchises disposed				1
Retail commercial truck dealership
Interim Financial Statements [Line Items]
Revenues | $		$ 919.2	$ 768.7	$ 1,814.8	$ 1,561.0
Number of operating locations | location	44	44		44
Retail commercial truck dealership | Transolutions Truck Centres
Interim Financial Statements [Line Items]
Number of full service dealerships acquired | dealership	3
Number of service and parts centers acquired | center	2
Retail commercial truck dealership | U.S. and Ontario, Canada
Interim Financial Statements [Line Items]
Number of states with dealerships | state	9	9		9
Penske Truck Leasing Co L P
Interim Financial Statements [Line Items]
Number of vehicles in fleet | vehicle	431	431		431
Penske Truck Leasing Co L P | Penske Corporation
Interim Financial Statements [Line Items]
Penske transportation solutions, ownership percentage				41.10%
Penske Truck Leasing Co L P | Mitsui and Co
Interim Financial Statements [Line Items]
Penske transportation solutions, ownership percentage				30.00%
Penske Truck Leasing Co L P
Interim Financial Statements [Line Items]
Penske transportation solutions, ownership percentage	28.90%	28.90%		28.90%