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)			222,976
Equity compensation	22.6	22.6		22.6
Repurchases of common stock (in shares)			(2,690,741)
Repurchases of common stock	(367.6)	(367.6)		(22.6)	(345.0)
Dividends	(135.8)	(135.8)			(135.8)
Distributions to non-controlling interest	(3.1)						(3.1)
Foreign currency translation	(14.7)	(14.6)				(14.6)	(0.1)
Other	8.3	8.3				8.3
Net income	866.6	862.5			862.5		4.1
Ending balance (in shares) at Sep. 30, 2023			67,214,126
Ending balance at Sep. 30, 2023	4,551.1	4,523.4	$ 0.0	0.0	4,865.0	(341.6)	27.7
Beginning balance (in shares) at Jun. 30, 2023			67,305,089
Beginning balance at Jun. 30, 2023	4,409.7	4,382.1	$ 0.0	0.0	4,657.9	(275.8)	27.6
Increase (decrease) in stockholders' equity
Equity compensation (in shares)			(3,781)
Equity compensation	6.6	6.6		6.6
Repurchases of common stock (in shares)			(87,182)
Repurchases of common stock	(14.3)	(14.3)		(6.6)	(7.7)
Dividends	(48.6)	(48.6)			(48.6)
Distributions to non-controlling interest	(0.4)						(0.4)
Foreign currency translation	(66.4)	(65.9)				(65.9)	(0.5)
Other	0.1	0.1				0.1
Net income	264.4	263.4			263.4		1.0
Ending balance (in shares) at Sep. 30, 2023			67,214,126
Ending balance at Sep. 30, 2023	$ 4,551.1	4,523.4	$ 0.0	0.0	4,865.0	(341.6)	27.7
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)			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		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		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