CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenues	$ 23,179.4	$ 22,785.1	$ 21,386.9
Cost of sales:
Total cost of sales	19,723.9	19,370.2	18,164.4
Gross profit	3,455.5	3,414.9	3,222.5
Selling, general and administrative expenses	2,693.2	2,646.3	2,516.0
Depreciation	109.6	103.7	95.1
Operating income	652.7	664.9	611.4
Floor plan interest expense	(84.5)	(80.9)	(63.4)
Other interest expense	(124.2)	(114.7)	(107.4)
Equity in earnings of affiliates	147.5	134.8	107.6
Income from continuing operations before income taxes	591.5	604.1	548.2
Income taxes	(156.7)	(134.3)	64.8
Income from continuing operations	434.8	469.8	613.0
Income (loss) from discontinued operations, net of tax	0.3	0.5	(0.2)
Net income	435.1	470.3	612.8
Less: Loss attributable to non-controlling interests	(0.7)	(0.7)	(0.5)
Net income attributable to Penske Automotive Group common stockholders	$ 435.8	$ 471.0	$ 613.3
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 5.28	$ 5.52	$ 7.14
Discontinued operations (in dollars per share)	0.00	0.01	0.00
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 5.28	$ 5.53	$ 7.14
Shares used in determining basic earnings per share (in shares)	82,495,045	85,165,367	85,877,227
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 5.28	$ 5.52	$ 7.14
Discontinued operations (in dollars per share)	0.00	0.01	0.00
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 5.28	$ 5.53	$ 7.14
Shares used in determining diluted earnings per share (in shares)	82,495,045	85,165,367	85,877,227
Amounts attributable to Penske Automotive Group common stockholders:
Income from continuing operations	$ 434.8	$ 469.8	$ 613.0
Less: Loss attributable to non-controlling interests	(0.7)	(0.7)	(0.5)
Income from continuing operations, net of tax	435.5	470.5	613.5
Income (loss) from discontinued operations, net of tax	0.3	0.5	(0.2)
Net income attributable to Penske Automotive Group common stockholders	$ 435.8	$ 471.0	$ 613.3
Cash dividends per share (in dollars per share)	$ 1.58	$ 1.42	$ 1.26
Retail Automotive Dealership
Revenue:
Total revenues	$ 20,615.8	$ 20,849.2	$ 19,824.3
Cost of sales:
Total cost of sales	17,576.9	17,790.6	16,899.5
Retail Commercial Truck Dealership
Revenue:
Total revenues	2,050.5	1,374.5	1,048.0
Cost of sales:
Total cost of sales	1,772.7	1,163.0	882.2
Commercial Vehicle Distribution and Other
Revenue:
Total revenues	513.1	561.4	514.6
Cost of sales:
Total cost of sales	$ 374.3	$ 416.6	$ 382.7