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)			167,510
Equity compensation	22.4	22.4		22.4
Repurchases of common stock (in shares)			(511,073)
Repurchases of common stock	(76.7)	(76.7)		(15.4)	(61.3)
Dividends	(194.7)	(194.7)			(194.7)
Distributions to non-controlling interest	(2.6)						(2.6)
Foreign currency translation	61.1	60.8				60.8	0.3
Other	(17.2)	(17.2)			(8.1)	(9.1)
Net income	686.1	682.5			682.5		3.6
Ending balance (in shares) at Sep. 30, 2024			66,767,618
Ending balance at Sep. 30, 2024	5,234.0	5,203.3	$ 0.0	7.0	5,408.7	(212.4)	30.7
Beginning balance (in shares) at Jun. 30, 2024			66,770,815
Beginning balance at Jun. 30, 2024	4,986.3	4,954.6	$ 0.0	0.0	5,254.3	(299.7)	31.7
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			(2,721)
Equity compensation	7.1	7.1		7.1
Repurchases of common stock (in shares)			(476)
Repurchases of common stock	(0.1)	(0.1)		(0.1)
Dividends	(71.7)	(71.7)			(71.7)
Distributions to non-controlling interest	(2.1)						(2.1)
Foreign currency translation	95.3	95.1				95.1	0.2
Other	(7.8)	(7.8)				(7.8)
Net income	227.0	226.1			226.1		0.9
Ending balance (in shares) at Sep. 30, 2024			66,767,618
Ending balance at Sep. 30, 2024	$ 5,234.0	5,203.3	$ 0.0	7.0	5,408.7	(212.4)	30.7
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)			154,835
Equity compensation	24.3	24.3		24.3
Repurchases of common stock (in shares)			(934,122)
Repurchases of common stock	(142.3)	(142.3)		(33.4)	(108.9)
Dividends	(252.7)	(252.7)			(252.7)
Distributions to non-controlling interest	(2.2)						(2.2)
Foreign currency translation	158.8	158.2				158.2	0.6
Other	2.7	2.7				2.7
Net income	$ 709.4	707.3			707.3		2.1
Ending balance (in shares) at Sep. 30, 2025	65,995,364		65,995,364
Ending balance at Sep. 30, 2025	$ 5,725.3	5,707.3	$ 0.0	0.0	5,910.9	(203.6)	18.0
Beginning balance (in shares) at Jun. 30, 2025			66,044,106
Beginning balance at Jun. 30, 2025	5,631.4	5,613.7	$ 0.0	0.0	5,786.1	(172.4)	17.7
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			108
Equity compensation	7.4	7.4		7.4
Repurchases of common stock (in shares)			(48,850)
Repurchases of common stock	(8.3)	(8.3)		(7.4)	(0.9)
Dividends	(87.3)	(87.3)			(87.3)
Distributions to non-controlling interest	(0.2)						(0.2)
Foreign currency translation	(29.6)	(29.6)				(29.6)
Other	(1.6)	(1.6)				(1.6)
Net income	$ 213.5	213.0			213.0		0.5
Ending balance (in shares) at Sep. 30, 2025	65,995,364		65,995,364
Ending balance at Sep. 30, 2025	$ 5,725.3	$ 5,707.3	$ 0.0	$ 0.0	$ 5,910.9	$ (203.6)	$ 18.0