CONSOLIDATED CONDENSED 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, 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)					307,846
Equity compensation	14.6		14.6			14.6
Repurchase of common stock (in shares)					(2,866,556)
Repurchases of common stock	(292.6)		(292.6)			(56.8)	(235.8)
Dividends	(74.4)		(74.4)				(74.4)
Distributions to non-controlling interest	(2.7)									(2.7)
Foreign currency translation	(148.8)		(147.6)						(147.6)	(1.2)
Other	4.5		4.5						4.5	0.0
Net income	745.4		741.9				741.9			3.5
Ending balance (in shares) at Jun. 30, 2022					75,015,462
Ending balance at Jun. 30, 2022	4,219.4		4,194.8		$ 0.0	0.0	4,506.7		(311.9)	24.6
Beginning balance (in shares) at Mar. 31, 2022					76,658,405
Beginning balance at Mar. 31, 2022	4,164.4		4,138.8		$ 0.0	0.0	4,336.9		(198.1)	25.6
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					20,164
Equity compensation	7.2		7.2			7.2
Repurchase of common stock (in shares)					(1,663,107)
Repurchases of common stock	(173.4)		(173.4)			(7.2)	(166.2)
Dividends	(38.0)		(38.0)				(38.0)
Distributions to non-controlling interest	(2.1)									(2.1)
Foreign currency translation	(120.3)		(119.5)						(119.5)	(0.8)
Other	5.7		5.7						5.7
Net income	375.9		374.0				374.0			1.9
Ending balance (in shares) at Jun. 30, 2022					75,015,462
Ending balance at Jun. 30, 2022	$ 4,219.4		4,194.8		$ 0.0	0.0	4,506.7		(311.9)	24.6
Beginning balance (in shares) at Dec. 31, 2022	69,681,891				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)					226,757
Equity compensation	16.0		16.0			16.0
Repurchase of common stock (in shares)					(2,603,559)
Repurchases of common stock	(353.3)		(353.3)			(16.0)	(337.3)
Dividends	(87.2)		(87.2)				(87.2)
Distributions to non-controlling interest	(2.7)									(2.7)
Foreign currency translation	51.7		51.3						51.3	0.4
Other	8.2		8.2						8.2
Net income	$ 602.2		599.1				599.1			3.1
Ending balance (in shares) at Jun. 30, 2023	67,305,089				67,305,089
Ending balance at Jun. 30, 2023	$ 4,409.7		4,382.1		$ 0.0	0.0	4,657.9		(275.8)	27.6
Beginning balance (in shares) at Mar. 31, 2023					69,000,558
Beginning balance at Mar. 31, 2023	4,351.4		4,323.3		$ 0.0	0.0	4,635.8		(312.5)	28.1
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					17,763
Equity compensation	8.2		8.2			8.2
Repurchase of common stock (in shares)					(1,713,232)
Repurchases of common stock	(242.0)		(242.0)			(8.2)	(233.8)
Dividends	(44.9)		(44.9)				(44.9)
Distributions to non-controlling interest	(2.4)									(2.4)
Foreign currency translation	33.4		33.3						33.3	0.1
Other	3.4		3.4						3.4
Net income	$ 302.6		300.8				300.8			1.8
Ending balance (in shares) at Jun. 30, 2023	67,305,089				67,305,089
Ending balance at Jun. 30, 2023	$ 4,409.7		$ 4,382.1		$ 0.0	$ 0.0	$ 4,657.9		$ (275.8)	$ 27.6