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)					306,588
Equity compensation	20.9		20.9			20.9
Repurchase of common stock (in shares)					(5,677,902)
Repurchases of common stock	(602.0)		(602.0)			(63.1)	(538.9)
Dividends	(113.6)		(113.6)				(113.6)
Distributions to non-controlling interest	(3.3)									(3.3)
Foreign currency translation	(281.2)		(279.1)						(279.1)	(2.1)
Other	6.9		6.9						6.9	0.0
Net income	1,086.9		1,082.0				1,082.0			4.9
Ending balance (in shares) at Sep. 30, 2022					72,202,858
Ending balance at Sep. 30, 2022	4,088.0		4,063.5		$ 0.0	0.0	4,504.5		(441.0)	24.5
Beginning balance (in shares) at Jun. 30, 2022					75,015,462
Beginning balance at Jun. 30, 2022	4,219.4		4,194.8		$ 0.0	0.0	4,506.7		(311.9)	24.6
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					(1,258)
Equity compensation	6.3		6.3			6.3
Repurchase of common stock (in shares)					(2,811,346)
Repurchases of common stock	(309.4)		(309.4)			(6.3)	(303.1)
Dividends	(39.2)		(39.2)				(39.2)
Distributions to non-controlling interest	(0.6)									(0.6)
Foreign currency translation	(132.4)		(131.5)						(131.5)	(0.9)
Other	2.4		2.4						2.4
Net income	341.5		340.1				340.1			1.4
Ending balance (in shares) at Sep. 30, 2022					72,202,858
Ending balance at Sep. 30, 2022	$ 4,088.0		4,063.5		$ 0.0	0.0	4,504.5		(441.0)	24.5
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)					222,976
Equity compensation	22.6		22.6			22.6
Repurchase 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				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
Repurchase 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				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