CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue:
Total revenues	$ 29,527.4	$ 27,814.8	$ 25,554.7
Cost of sales:
Total cost of sales	24,593.6	22,976.0	21,113.9
Gross profit	4,933.8	4,838.8	4,440.8
Selling, general and administrative expenses	3,400.6	3,223.7	2,962.9
Impairment charges	40.7	0.0	0.0
Depreciation	141.0	127.3	121.5
Operating income	1,351.5	1,487.8	1,356.4
Floor plan interest expense	(133.1)	(52.4)	(26.2)
Other interest expense	(92.6)	(70.4)	(68.6)
Debt redemption costs	0.0	0.0	(17.0)
Loss on investment	0.0	0.0	(11.4)
Equity in earnings of affiliates	293.7	494.2	374.5
Income from continuing operations before income taxes	1,419.5	1,859.2	1,607.7
Income taxes	(360.9)	(473.0)	(416.3)
Income from continuing operations	1,058.6	1,386.2	1,191.4
Income from discontinued operations, net of tax	0.0	0.0	1.3
Net income	1,058.6	1,386.2	1,192.7
Less: Income attributable to non-controlling interests	5.4	6.2	4.9
Net income attributable to Penske Automotive Group common stockholders	$ 1,053.2	$ 1,380.0	$ 1,187.8
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 15.50	$ 18.55	$ 14.88
Discontinued operations (in dollars per share)	0.00	0.00	0.01
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 15.50	$ 18.55	$ 14.89
Shares used in determining basic earnings per share (in shares)	67,963,956	74,394,799	79,746,106
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 15.50	$ 18.55	$ 14.88
Discontinued operations (in dollars per share)	0.00	0.00	0.01
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 15.50	$ 18.55	$ 14.89
Shares used in determining diluted earnings per share (in shares)	67,963,956	74,394,799	79,746,106
Amounts attributable to Penske Automotive Group common stockholders:
Income from continuing operations	$ 1,058.6	$ 1,386.2	$ 1,191.4
Less: Income attributable to non-controlling interests	5.4	6.2	4.9
Income from continuing operations, net of tax	1,053.2	1,380.0	1,186.5
Income from discontinued operations, net of tax	0.0	0.0	1.3
Net income attributable to Penske Automotive Group common stockholders	$ 1,053.2	$ 1,380.0	$ 1,187.8
Cash dividends per share (in dollars per share)	$ 2.78	$ 2.07	$ 1.78
Retail automotive dealership
Revenue:
Total revenues	$ 25,209.1	$ 23,694.7	$ 22,513.3
Cost of sales:
Total cost of sales	21,032.9	19,568.3	18,643.1
Impairment charges	40.7
Retail commercial truck dealership
Revenue:
Total revenues	3,684.3	3,541.3	2,465.7
Cost of sales:
Total cost of sales	3,091.9	2,986.2	2,048.8
Impairment charges	0.0
Commercial vehicle distribution and other
Revenue:
Total revenues	634.0	578.8	575.7
Cost of sales:
Total cost of sales	$ 468.8	$ 421.5	$ 422.0