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
Beginning balance at Dec. 31, 2020	$ 3,326.1		$ 3,302.5		$ 0.0	$ 311.8	$ 3,151.3		$ (160.6)	$ 23.6
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					426,289
Equity compensation	18.8		18.8			18.8
Repurchase of common stock (in shares)					(2,524,938)
Repurchases of common stock	(219.8)		(219.8)			(219.8)
Dividends	(106.3)		(106.3)				(106.3)
Interest rate swaps	3.8		3.8						3.8
Distributions to non-controlling interest	(1.9)									(1.9)
Foreign currency translation	(40.7)		(40.0)						(40.0)	(0.7)
Other	6.6		6.6						6.6	0.0
Net income	879.8		876.5				876.5			3.3
Balance (in shares) at Sep. 30, 2021					78,294,013
Ending balance at Sep. 30, 2021	3,866.4		3,842.1		$ 0.0	110.8	3,921.5		(190.2)	24.3
Balance (in shares) at Dec. 31, 2020					80,392,662
Beginning balance at Dec. 31, 2020	$ 3,326.1		3,302.5		$ 0.0	311.8	3,151.3		(160.6)	23.6
Increase (decrease) in stockholders' equity
Accounting standards update	Accounting Standards Update 2016-02 [Member]
Balance (in shares) at Dec. 31, 2021					77,574,172
Ending balance at Dec. 31, 2021	$ 4,095.0	$ (121.6)	4,070.0	$ (121.6)	$ 0.0	42.2	4,196.6	$ (121.6)	(168.8)	25.0
Balance (in shares) at Jun. 30, 2021					80,330,836
Beginning balance at Jun. 30, 2021	3,762.7		3,738.7		$ 0.0	284.0	3,602.5		(147.8)	24.0
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					(7,192)
Equity compensation	5.7		5.7			5.7
Repurchase of common stock (in shares)					(2,029,631)
Repurchases of common stock	(178.9)		(178.9)			(178.9)
Dividends	(36.1)		(36.1)				(36.1)
Interest rate swaps	0.3		0.3						0.3
Distributions to non-controlling interest	(0.5)									(0.5)
Foreign currency translation	(42.6)		(42.2)						(42.2)	(0.4)
Other	(0.5)		(0.5)						(0.5)
Net income	356.3		355.1				355.1			1.2
Balance (in shares) at Sep. 30, 2021					78,294,013
Ending balance at Sep. 30, 2021	3,866.4		3,842.1		$ 0.0	110.8	3,921.5		(190.2)	24.3
Balance (in shares) at Dec. 31, 2021					77,574,172
Beginning balance at Dec. 31, 2021	4,095.0	$ (121.6)	4,070.0	$ (121.6)	$ 0.0	42.2	4,196.6	$ (121.6)	(168.8)	25.0
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					306,588
Equity compensation	20.9		20.9			20.9
Repurchase of common stock (in shares)					(5,677,902)
Repurchases of common stock	(602.0)		(602.0)			(63.1)	(538.9)
Dividends	(113.6)		(113.6)				(113.6)
Interest rate swaps	0.0
Distributions to non-controlling interest	(3.3)									(3.3)
Foreign currency translation	(281.2)		(279.1)						(279.1)	(2.1)
Other	6.9		6.9						6.9
Net income	1,086.9		1,082.0				1,082.0			4.9
Balance (in shares) at Sep. 30, 2022					72,202,858
Ending balance at Sep. 30, 2022	4,088.0		4,063.5		$ 0.0	0.0	4,504.5		(441.0)	24.5
Balance (in shares) at Jun. 30, 2022					75,015,462
Beginning balance at Jun. 30, 2022	4,219.4		4,194.8		$ 0.0	0.0	4,506.7		(311.9)	24.6
Increase (decrease) in stockholders' equity
Equity compensation (in shares)					(1,258)
Equity compensation	6.3		6.3			6.3
Repurchase of common stock (in shares)					(2,811,346)
Repurchases of common stock	(309.4)		(309.4)			(6.3)	(303.1)
Dividends	(39.2)		(39.2)				(39.2)
Interest rate swaps	0.0
Distributions to non-controlling interest	(0.6)									(0.6)
Foreign currency translation	(132.4)		(131.5)						(131.5)	(0.9)
Other	2.4		2.4						2.4
Net income	341.5		340.1				340.1			1.4
Balance (in shares) at Sep. 30, 2022					72,202,858
Ending balance at Sep. 30, 2022	$ 4,088.0		$ 4,063.5		$ 0.0	$ 0.0	$ 4,504.5		$ (441.0)	$ 24.5