CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Total Penske Automotive Group Stockholders' Equity	Total Penske Automotive Group Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Voting and Non-voting Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2021					77,574,172
Beginning balance at Dec. 31, 2021	$ 4,095.0	$ (121.6)	$ 4,070.0	$ (121.6)	$ 0.0	$ 42.2	$ 4,196.6	$ (121.6)	$ (168.8)	$ 25.0
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					321,866
Equity compensation	26.7		26.7			26.7
Repurchases of common stock (in shares)					(8,214,147)
Repurchases of common stock	(886.5)		(886.5)			(68.9)	(817.6)
Dividends	(154.1)		(154.1)				(154.1)
Distributions to non-controlling interest	(3.5)									(3.5)
Foreign currency translation	(154.6)		(153.7)						(153.7)	(0.9)
Other	(12.8)		(12.8)						(12.8)
Net income	1,386.2		1,380.0				1,380.0			6.2
Ending balance (in shares) at Dec. 31, 2022					69,681,891
Ending 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)					237,906
Equity compensation	28.1		28.1			28.1
Repurchases of common stock (in shares)					(2,808,616)
Repurchases of common stock	(385.2)		(385.2)			(28.1)	(357.1)
Dividends	(189.1)		(189.1)				(189.1)
Distributions to non-controlling interest	(3.4)									(3.4)
Foreign currency translation	66.1		65.5						65.5	0.6
Other	5.7		5.7						5.7
Net income	$ 1,058.6		1,053.2				1,053.2			5.4
Ending balance (in shares) at Dec. 31, 2023	67,111,181				67,111,181
Ending 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)					180,715
Equity compensation	29.4		29.4			29.4
Repurchases of common stock (in shares)					(517,245)
Repurchases of common stock	(78.0)		(78.0)			(16.7)	(61.3)
Dividends	(274.4)		(274.4)				(274.4)
Purchase of subsidiary shares from non-controlling interest	(16.7)		(3.6)			(3.6)				(13.1)
Distributions to non-controlling interest	(2.8)									(2.8)
Foreign currency translation	(91.9)		(91.4)						(91.4)	(0.5)
Other	(17.3)		(17.3)				(8.3)		(9.0)
Net income	$ 923.4		918.9				918.9			4.5
Ending balance (in shares) at Dec. 31, 2024	66,774,651				66,774,651
Ending balance at Dec. 31, 2024	$ 5,227.3		$ 5,209.8		$ 0.0	$ 9.1	$ 5,565.2		$ (364.5)	$ 17.5