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, 2023			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
Repurchases 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
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
Repurchases 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
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 Dec. 31, 2024	66,774,651		66,774,651
Beginning balance at Dec. 31, 2024	$ 5,227.3	5,209.8	$ 0.0	9.1	5,565.2	(364.5)	17.5
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			154,727
Equity compensation	16.9	16.9		16.9
Repurchases of common stock (in shares)			(885,272)
Repurchases of common stock	(134.0)	(134.0)		(26.0)	(108.0)
Dividends	(165.4)	(165.4)			(165.4)
Distributions to non-controlling interest	(2.0)						(2.0)
Foreign currency translation	188.4	187.8				187.8	0.6
Other	4.3	4.3				4.3
Net income	$ 495.9	494.3			494.3		1.6
Ending balance (in shares) at Jun. 30, 2025	66,044,106		66,044,106
Ending balance at Jun. 30, 2025	$ 5,631.4	5,613.7	$ 0.0	0.0	5,786.1	(172.4)	17.7
Beginning balance (in shares) at Mar. 31, 2025			66,664,013
Beginning balance at Mar. 31, 2025	5,412.7	5,394.7	$ 0.0	0.0	5,704.3	(309.6)	18.0
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			10,137
Equity compensation	8.9	8.9		8.9
Repurchases of common stock (in shares)			(630,044)
Repurchases of common stock	(93.5)	(93.5)		(8.9)	(84.6)
Dividends	(83.6)	(83.6)			(83.6)
Distributions to non-controlling interest	(1.7)						(1.7)
Foreign currency translation	133.1	132.6				132.6	0.5
Other	4.6	4.6				4.6
Net income	$ 250.9	250.0			250.0		0.9
Ending balance (in shares) at Jun. 30, 2025	66,044,106		66,044,106
Ending balance at Jun. 30, 2025	$ 5,631.4	$ 5,613.7	$ 0.0	$ 0.0	$ 5,786.1	$ (172.4)	$ 17.7