CONSOLIDATED 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 at Dec. 31, 2018	$ 2,634.7	$ 5.0	$ 2,609.1	$ 5.0	$ 0.0	$ 477.8	$ 2,365.8	$ 5.0	$ (234.5)	$ 25.6
Balance (in shares) at Dec. 31, 2018					84,546,970
Increase (decrease) in stockholders' equity
Accounting standards update	Accounting Standards Update 2016-02 [Member]
Equity compensation	$ 16.7		16.7			16.7
Equity compensation (in shares)					524,617
Repurchases of common stock	(174.1)		(174.1)			(174.1)
Repurchases of common stock (in shares)					(3,986,836)
Dividends	(130.8)		(130.8)				(130.8)
Purchase of subsidiary shares from non-controlling interest	(7.0)									(7.0)
Interest rate swaps	0.0
Purchase of subsidiary shares from non-controlling interest	(0.5)									(0.5)
Foreign currency translation	21.9		22.2						22.2	(0.3)
Other	10.6		9.5						9.5	1.1
Net income	435.1		435.8				435.8			(0.7)
Balance at Dec. 31, 2019	2,811.6		2,793.4		$ 0.0	320.4	2,675.8		(202.8)	18.2
Balance (in shares) at Dec. 31, 2019					81,084,751
Increase (decrease) in stockholders' equity
Equity compensation	25.8		25.8			25.8
Equity compensation (in shares)					335,647
Repurchases of common stock	(34.4)		(34.4)			(34.4)
Repurchases of common stock (in shares)					(1,027,736)
Dividends	(68.1)		(68.1)				(68.1)
Interest rate swaps	(3.2)		(3.2)						(3.2)
Purchase of subsidiary shares from non-controlling interest	(5.0)									(5.0)
Foreign currency translation	51.3		50.6						50.6	0.7
Other	2.8		(5.2)						(5.2)	8.0
Net income	545.3		543.6				543.6			1.7
Balance at Dec. 31, 2020	3,326.1		3,302.5		$ 0.0	311.8	3,151.3		(160.6)	23.6
Balance (in shares) at Dec. 31, 2020					80,392,662
Increase (decrease) in stockholders' equity
Equity compensation	23.9		23.9			23.9
Equity compensation (in shares)					443,090
Repurchases of common stock	(293.5)		(293.5)			(293.5)
Repurchases of common stock (in shares)					(3,261,580)
Dividends	(142.5)		(142.5)				(142.5)
Interest rate swaps	3.2		3.2						3.2
Purchase of subsidiary shares from non-controlling interest	(2.6)									(2.6)
Foreign currency translation	(39.8)		(38.9)						(38.9)	(0.9)
Other	27.5		27.5						27.5	0.0
Net income	1,192.7		1,187.8				1,187.8			4.9
Balance at Dec. 31, 2021	$ 4,095.0		$ 4,070.0		$ 0.0	$ 42.2	$ 4,196.6		$ (168.8)	$ 25.0
Balance (in shares) at Dec. 31, 2021					77,574,172