CONSOLIDATED CONDENSED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Total Penske Automotive Group Stockholders' Equity	Voting and Non-voting Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2022			69,681,891
Beginning balance at Dec. 31, 2022	$ 4,174.8	$ 4,148.0	$ 0.0	$ 0.0	$ 4,483.3	$ (335.3)	$ 26.8
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			226,757
Equity compensation	16.0	16.0		16.0
Repurchase of common stock (in shares)			(2,603,559)
Repurchases of common stock	(353.3)	(353.3)		(16.0)	(337.3)
Dividends	(87.2)	(87.2)			(87.2)
Distributions to non-controlling interest	(2.7)						(2.7)
Foreign currency translation	51.7	51.3				51.3	0.4
Other	8.2	8.2				8.2
Net income	602.2	599.1			599.1		3.1
Ending balance (in shares) at Jun. 30, 2023			67,305,089
Ending balance at Jun. 30, 2023	4,409.7	4,382.1	$ 0.0	0.0	4,657.9	(275.8)	27.6
Beginning balance (in shares) at Mar. 31, 2023			69,000,558
Beginning balance at Mar. 31, 2023	4,351.4	4,323.3	$ 0.0	0.0	4,635.8	(312.5)	28.1
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			17,763
Equity compensation	8.2	8.2		8.2
Repurchase of common stock (in shares)			(1,713,232)
Repurchases of common stock	(242.0)	(242.0)		(8.2)	(233.8)
Dividends	(44.9)	(44.9)			(44.9)
Distributions to non-controlling interest	(2.4)						(2.4)
Foreign currency translation	33.4	33.3				33.3	0.1
Other	3.4	3.4				3.4
Net income	302.6	300.8			300.8		1.8
Ending balance (in shares) at Jun. 30, 2023			67,305,089
Ending balance at Jun. 30, 2023	$ 4,409.7	4,382.1	$ 0.0	0.0	4,657.9	(275.8)	27.6
Beginning balance (in shares) at Dec. 31, 2023	67,111,181		67,111,181
Beginning balance at Dec. 31, 2023	$ 4,755.6	4,726.2	$ 0.0	0.0	4,990.3	(264.1)	29.4
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			170,231
Equity compensation	15.3	15.3		15.3
Repurchase of common stock (in shares)			(510,597)
Repurchases of common stock	(76.6)	(76.6)		(15.3)	(61.3)
Dividends	(123.0)	(123.0)			(123.0)
Distributions to non-controlling interest	(0.5)						(0.5)
Foreign currency translation	(34.2)	(34.3)				(34.3)	0.1
Other	(9.4)	(9.4)			(8.1)	(1.3)
Net income	$ 459.1	456.4			456.4		2.7
Ending balance (in shares) at Jun. 30, 2024	66,770,815		66,770,815
Ending balance at Jun. 30, 2024	$ 4,986.3	4,954.6	$ 0.0	0.0	5,254.3	(299.7)	31.7
Beginning balance (in shares) at Mar. 31, 2024			67,049,359
Beginning balance at Mar. 31, 2024	4,846.1	4,815.8	$ 0.0	0.0	5,113.1	(297.3)	30.3
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			10,724
Equity compensation	7.7	7.7		7.7
Repurchase of common stock (in shares)			(289,268)
Repurchases of common stock	(43.3)	(43.3)		(7.7)	(35.6)
Dividends	(64.4)	(64.4)			(64.4)
Distributions to non-controlling interest	(0.2)						(0.2)
Foreign currency translation	2.4	2.5				2.5	(0.1)
Other	(4.9)	(4.9)				(4.9)
Net income	$ 242.9	241.2			241.2		1.7
Ending balance (in shares) at Jun. 30, 2024	66,770,815		66,770,815
Ending balance at Jun. 30, 2024	$ 4,986.3	$ 4,954.6	$ 0.0	$ 0.0	$ 5,254.3	$ (299.7)	$ 31.7