CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Total revenues	$ 6,987.5	$ 3,651.1	$ 12,761.3	$ 8,660.2
Cost of sales:
Total cost of sales	5,804.8	3,098.2	10,665.4	7,330.6
Gross profit	1,182.7	552.9	2,095.9	1,329.6
Selling, general and administrative expenses	749.8	453.6	1,414.1	1,095.4
Depreciation	30.2	27.9	59.5	56.4
Operating income	402.7	71.4	622.3	177.8
Floor plan interest expense	(7.9)	(11.7)	(17.4)	(29.4)
Other interest expense	(19.7)	(28.4)	(37.6)	(60.1)
Debt redemption costs	(17.0)		(17.0)
Equity in earnings of affiliates	105.6	29.9	161.0	44.4
Income from continuing operations before income taxes	463.7	61.2	711.3	132.7
Income taxes	(123.4)	(16.5)	(187.9)	(36.6)
Income from continuing operations	340.3	44.7	523.4	96.1
Income from discontinued operations, net of tax	0.1	0.1	0.1	0.2
Net income	340.4	44.8	523.5	96.3
Less: Income (loss) attributable to non-controlling interests	1.5	(0.3)	2.1	(0.5)
Net income attributable to Penske Automotive Group common stockholders	$ 338.9	$ 45.1	$ 521.4	$ 96.8
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 4.20	$ 0.56	$ 6.46	$ 1.20
Discontinued operations (in dollars per share)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 4.20	$ 0.56	$ 6.46	$ 1.20
Shares used in determining basic earnings per share (in shares)	80,691,996	80,421,478	80,649,824	80,731,889
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 4.20	$ 0.56	$ 6.46	$ 1.20
Discontinued operations (in dollars per share)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 4.20	$ 0.56	$ 6.46	$ 1.20
Shares used in determining diluted earnings per share (in shares)	80,726,438	80,461,478	80,684,266	80,771,889
Amounts attributable to Penske Automotive Group common stockholders:
Income from continuing operations	$ 340.3	$ 44.7	$ 523.4	$ 96.1
Less: Income (loss) attributable to non-controlling interests	1.5	(0.3)	2.1	(0.5)
Income from continuing operations, net of tax	338.8	45.0	521.3	96.6
Income from discontinued operations, net of tax	0.1	0.1	0.1	0.2
Net income attributable to Penske Automotive Group common stockholders	$ 338.9	45.1	$ 521.4	$ 96.8
Cash dividends per share (in dollars per share)	$ 0.44		$ 0.87	$ 0.42
Retail automotive dealership
Revenue:
Total revenues	$ 6,197.6	3,153.5	$ 11,404.5	$ 7,570.1
Cost of sales:
Total cost of sales	5,157.2	2,687.2	9,564.2	6,425.7
Retail commercial truck dealership
Revenue:
Total revenues	625.3	399.2	1,060.0	890.6
Cost of sales:
Total cost of sales	522.6	339.0	877.3	761.6
Commercial vehicle distribution
Revenue:
Total revenues	164.6	98.4	296.8	199.5
Cost of sales:
Total cost of sales	$ 125.0	$ 72.0	$ 223.9	$ 143.3