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
Balance (in shares) at Dec. 31, 2020					80,392,662
Balance at Dec. 31, 2020	$ 3,326.1		$ 3,302.5			$ 311.8	$ 3,151.3		$ (160.6)	$ 23.6
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					434,995
Equity compensation	6.6		6.6			6.6
Dividends	(34.6)		(34.6)				(34.6)
Interest rate swaps	3.9		3.9						3.9
Distributions to non-controlling interest	(1.2)									(1.2)
Foreign currency translation	0.1		0.6						0.6	(0.5)
Other	0.7		0.7						0.7	0.0
Net income	183.1		182.5				182.5			0.6
Balance (in shares) at Mar. 31, 2021					80,827,657
Balance at Mar. 31, 2021	3,484.7		3,462.2			318.4	3,299.2		(155.4)	22.5
Balance (in shares) at Dec. 31, 2021					77,574,172
Balance at Dec. 31, 2021	$ 4,095.0	$ (121.6)	4,070.0	$ (121.6)		42.2	4,196.6	$ (121.6)	(168.8)	25.0
Increase (decrease) in stockholders' equity
Accounting standards update	Accounting Standards Update 2016-02 [Member]
Equity compensation (in shares)					287,682
Equity compensation	$ 7.4		7.4			7.4
Repurchases of common stock (in shares)					(1,203,449)
Repurchases of common stock	(119.2)		(119.2)			(49.6)	(69.6)
Dividends	(36.4)		(36.4)				(36.4)
Interest rate swaps	0.0
Distributions to non-controlling interest	(0.6)									(0.6)
Foreign currency translation	(28.5)		(28.1)						(28.1)	(0.4)
Other	(1.2)		(1.2)						(1.2)
Net income	369.5		367.9				367.9			1.6
Balance (in shares) at Mar. 31, 2022					76,658,405
Balance at Mar. 31, 2022	$ 4,164.4		$ 4,138.8			$ 0.0	$ 4,336.9		$ (198.1)	$ 25.6