CONSOLIDATED CONDENSED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total Stockholders' Equity Attributable to Penske Automotive Group	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest	Total
Balance at Dec. 31, 2019	$ 2,793.4		$ 320.4	$ 2,675.8	$ (202.8)	$ 18.2	$ 2,811.6
Balance (in shares) at Dec. 31, 2019		81,084,751
Increase (decrease) in stockholders' equity
Equity compensation	4.9		4.9				4.9
Equity compensation (in shares)		268,722
Repurchases of common stock	(29.4)		(29.4)				(29.4)
Repurchases of common stock (in shares)		(890,195)
Dividends	(34.2)			(34.2)			(34.2)
Foreign currency translation	(92.7)				(92.7)	(0.2)	(92.9)
Other	(4.0)				(4.0)		(4.0)
Net income	51.7			51.7		(0.2)	51.5
Balance at Mar. 31, 2020	2,689.7		295.9	2,693.3	(299.5)	17.8	2,707.5
Balance (in shares) at Mar. 31, 2020		80,463,278
Balance at Dec. 31, 2020	3,302.5		311.8	3,151.3	(160.6)	23.6	3,326.1
Balance (in shares) at Dec. 31, 2020		80,392,662
Increase (decrease) in stockholders' equity
Equity compensation	6.6		6.6				6.6
Equity compensation (in shares)		434,995
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	0.6				0.6	(0.5)	0.1
Other	0.7				0.7		0.7
Net income	182.5			182.5		0.6	183.1
Balance at Mar. 31, 2021	$ 3,462.2		$ 318.4	$ 3,299.2	$ (155.4)	$ 22.5	$ 3,484.7
Balance (in shares) at Mar. 31, 2021		80,827,657