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	10.1		10.1				10.1
Equity compensation (in shares)		278,446
Repurchases of common stock	(34.2)		(34.2)				(34.2)
Repurchases of common stock (in shares)		(1,023,288)
Dividends	(34.2)			(34.2)			(34.2)
Interest rate swaps	(4.1)				(4.1)		(4.1)
Foreign currency translation	(65.2)				(65.2)	(0.1)	(65.3)
Other	(2.7)				(2.7)	0.1	(2.6)
Net income	96.8			96.8		(0.5)	96.3
Balance at Jun. 30, 2020	2,759.9		296.3	2,738.4	(274.8)	17.7	2,777.6
Balance (in shares) at Jun. 30, 2020		80,339,909
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
Increase (decrease) in stockholders' equity
Equity compensation	5.2		5.2				5.2
Equity compensation (in shares)		9,724
Repurchases of common stock	(4.8)		(4.8)				(4.8)
Repurchases of common stock (in shares)		(133,093)
Interest rate swaps	(4.1)				(4.1)		(4.1)
Foreign currency translation	27.5				27.5	0.1	27.6
Other	1.3				1.3	0.1	1.4
Net income	45.1			45.1		(0.3)	44.8
Balance at Jun. 30, 2020	2,759.9		296.3	2,738.4	(274.8)	17.7	2,777.6
Balance (in shares) at Jun. 30, 2020		80,339,909
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	13.1		13.1				13.1
Equity compensation (in shares)		433,481
Repurchases of common stock	(40.9)		(40.9)				(40.9)
Repurchases of common stock (in shares)		(495,307)
Dividends	(70.2)			(70.2)			(70.2)
Interest rate swaps	3.5				3.5		3.5
Distributions to non-controlling interest						(1.4)	(1.4)
Foreign currency translation	2.2				2.2	(0.3)	1.9
Other	7.1				7.1		7.1
Net income	521.4			521.4		2.1	523.5
Balance at Jun. 30, 2021	3,738.7		284.0	3,602.5	(147.8)	24.0	3,762.7
Balance (in shares) at Jun. 30, 2021		80,330,836
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
Increase (decrease) in stockholders' equity
Equity compensation	6.5		6.5				6.5
Equity compensation (in shares)		(1,514)
Repurchases of common stock	(40.9)		(40.9)				(40.9)
Repurchases of common stock (in shares)		(495,307)
Dividends	(35.6)			(35.6)			(35.6)
Interest rate swaps	(0.4)				(0.4)		(0.4)
Distributions to non-controlling interest						(0.2)	(0.2)
Foreign currency translation	1.6				1.6	0.2	1.8
Other	6.4				6.4		6.4
Net income	338.9			338.9		1.5	340.4
Balance at Jun. 30, 2021	$ 3,738.7		$ 284.0	$ 3,602.5	$ (147.8)	$ 24.0	$ 3,762.7
Balance (in shares) at Jun. 30, 2021		80,330,836