CONSOLIDATED CONDENSED STATEMENT 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, 2017	$ 2,395.2		$ 532.3	$ 2,009.4	$ (146.5)	$ 32.8	$ 2,428.0
Balance (in shares) at Dec. 31, 2017		85,787,507
Increase (decrease) in stockholders' equity
Adoption of ASC | ASC 606	6.6			6.6			6.6
Equity compensation	4.5		4.5				4.5
Equity compensation (in shares)		320,919
Repurchases of common stock	(50.0)		(50.0)				(50.0)
Repurchases of common stock (in shares)		(1,133,016)
Dividends	(29.2)			(29.2)			(29.2)
Purchase of subsidiary shares from non-controlling interest	(1.4)		(1.4)			(3.1)	(4.5)
Distributions to non-controlling interest						(0.1)	(0.1)
Foreign currency translation	30.7				30.7		30.7
Other	0.9		(0.2)		1.1	(0.3)	0.6
Net income	108.1			108.1		(0.3)	107.8
Balance at Mar. 31, 2018	2,465.4		485.2	2,094.9	(114.7)	29.0	2,494.4
Balance (in shares) at Mar. 31, 2018		84,975,410
Balance at Dec. 31, 2018	2,609.1		477.8	2,365.8	(234.5)	25.6	2,634.7
Balance (in shares) at Dec. 31, 2018		84,546,970
Increase (decrease) in stockholders' equity
Adoption of ASC | ASC 842	5.0			5.0			5.0
Equity compensation	4.6		4.6				4.6
Equity compensation (in shares)		362,887
Repurchases of common stock	(54.3)		(54.3)				(54.3)
Repurchases of common stock (in shares)		(1,258,348)
Dividends	(32.2)			(32.2)			(32.2)
Purchase of subsidiary shares from non-controlling interest						(4.8)	(4.8)
Distributions to non-controlling interest						(0.1)	(0.1)
Foreign currency translation	7.0				7.0	(0.3)	6.7
Other	1.8				1.8	0.3	2.1
Net income	100.2			100.2		(1.0)	99.2
Balance at Mar. 31, 2019	$ 2,641.2		$ 428.1	$ 2,438.8	$ (225.7)	$ 19.7	$ 2,660.9
Balance (in shares) at Mar. 31, 2019		83,651,509