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 Income (Loss)	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2020					80,392,662
Beginning balance at Dec. 31, 2020	$ 3,326.1		$ 3,302.5		$ 0.0	$ 311.8	$ 3,151.3		$ (160.6)	$ 23.6
Increase (decrease) in stockholders' equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-02 [Member]
Equity compensation (in shares)					443,090
Equity compensation	$ 23.9		23.9			23.9
Repurchases of common stock (in shares)					(3,261,580)
Repurchases of common stock	(293.5)		(293.5)			(293.5)
Dividends	(142.5)		(142.5)				(142.5)
Interest rate swaps	3.2		3.2						3.2
Distributions to non-controlling interest	(2.6)									(2.6)
Foreign currency translation	(39.8)		(38.9)						(38.9)	(0.9)
Other	27.5		27.5						27.5
Net income	1,192.7		1,187.8				1,187.8			4.9
Ending balance (in shares) at Dec. 31, 2021					77,574,172
Ending 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)
Interest rate swaps	0.0
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				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)
Interest rate swaps	0.0
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