CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue:
Total revenues	$ 30,455.2	$ 29,527.4	$ 27,814.8
Cost of sales:
Total cost of sales	25,441.9	24,593.6	22,976.0
Gross profit	5,013.3	4,933.8	4,838.8
Selling, general, and administrative expenses	3,538.5	3,400.6	3,223.7
Goodwill impairment charges	0.0	40.7	0.0
Depreciation	158.0	141.0	127.3
Operating income	1,316.8	1,351.5	1,487.8
Floor plan interest expense	(189.8)	(133.1)	(52.4)
Other interest expense	(87.8)	(92.6)	(70.4)
Equity in earnings of affiliates	200.7	293.7	494.2
Income before income taxes	1,239.9	1,419.5	1,859.2
Income taxes	(316.5)	(360.9)	(473.0)
Net income	923.4	1,058.6	1,386.2
Less: Income attributable to non-controlling interests	4.5	5.4	6.2
Net income attributable to Penske Automotive Group common stockholders	$ 918.9	$ 1,053.2	$ 1,380.0
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 13.74	$ 15.50	$ 18.55
Shares used in determining basic earnings per share (in shares)	66,882,731	67,963,956	74,394,799
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 13.74	$ 15.50	$ 18.55
Shares used in determining diluted earnings per share (in shares)	66,882,731	67,963,956	74,394,799
Amounts attributable to Penske Automotive Group common stockholders:
Net income	$ 923.4	$ 1,058.6	$ 1,386.2
Less: Income attributable to non-controlling interests	4.5	5.4	6.2
Net income attributable to Penske Automotive Group common stockholders	$ 918.9	$ 1,053.2	$ 1,380.0
Cash dividends per share (in dollars per share)	$ 4.09	$ 2.78	$ 2.07
Retail automotive dealership
Revenue:
Total revenues	$ 26,156.2	$ 25,209.1	$ 23,694.7
Cost of sales:
Total cost of sales	21,905.6	21,032.9	19,568.3
Goodwill impairment charges		40.7
Depreciation	137.4	124.7	112.7
Floor plan interest expense	(160.9)	(116.0)	(44.5)
Other interest expense	(82.1)	(90.3)	(65.1)
Equity in earnings of affiliates	3.1	3.9	3.5
Income before income taxes	792.7	860.5	1,118.0
Retail commercial truck dealership
Revenue:
Total revenues	3,521.1	3,684.3	3,541.3
Cost of sales:
Total cost of sales	2,936.6	3,091.9	2,986.2
Goodwill impairment charges		0.0
Depreciation	15.1	11.6	10.0
Floor plan interest expense	(19.2)	(14.5)	(7.5)
Other interest expense	0.0	(1.3)	(3.9)
Equity in earnings of affiliates	0.0	0.0	0.0
Income before income taxes	203.6	225.0	214.7
Commercial vehicle distribution and other
Revenue:
Total revenues	777.9	634.0	578.8
Cost of sales:
Total cost of sales	$ 599.7	$ 468.8	$ 421.5