CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Total revenues	$ 22,785.1	$ 21,386.9	$ 20,118.5
Cost of sales:
Total cost of sales	19,370.2	18,164.4	17,151.9
Gross profit	3,414.9	3,222.5	2,966.6
Selling, general and administrative expenses	2,646.3	2,516.0	2,302.0
Depreciation	103.7	95.1	89.7
Operating income	664.9	611.4	574.9
Floor plan interest expense	(80.9)	(63.4)	(50.9)
Other interest expense	(114.7)	(107.4)	(85.4)
Equity in earnings of affiliates	134.8	107.6	69.5
Income from continuing operations before income taxes	604.1	548.2	508.1
Income taxes	(134.3)	64.8	(160.7)
Income from continuing operations	469.8	613.0	347.4
Income (loss) from discontinued operations, net of tax	0.5	(0.2)	(1.0)
Net income	470.3	612.8	346.4
Less: (Loss) income attributable to non-controlling interests	(0.7)	(0.5)	3.5
Net income attributable to Penske Automotive Group common stockholders	$ 471.0	$ 613.3	$ 342.9
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 5.52	$ 7.14	$ 4.00
Discontinued operations (in dollars per share)	0.01	0.00	(0.01)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 5.53	$ 7.14	$ 3.99
Shares used in determining basic earnings per share (in shares)	85,165,367	85,877,227	86,000,754
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 5.52	$ 7.14	$ 4.00
Discontinued operations (in dollars per share)	0.01	0.00	(0.01)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 5.53	$ 7.14	$ 3.99
Shares used in determining diluted earnings per share (in shares)	85,165,367	85,877,227	86,000,754
Amounts attributable to Penske Automotive Group common stockholders:
Income from continuing operations	$ 469.8	$ 613.0	$ 347.4
Less: (Loss) income attributable to non-controlling interests	(0.7)	(0.5)	3.5
Income from continuing operations, net of tax	470.5	613.5	343.9
Income (loss) from discontinued operations, net of tax	0.5	(0.2)	(1.0)
Net income attributable to Penske Automotive Group common stockholders	$ 471.0	$ 613.3	$ 342.9
Cash dividends per share (in dollars per share)	$ 1.42	$ 1.26	$ 1.10
Retail Automotive Dealership
Revenue:
Total revenues	$ 20,849.2	$ 19,824.3	$ 18,673.2
Cost of sales:
Total cost of sales	17,790.6	16,899.5	15,968.4
Retail Commercial Truck Dealership
Revenue:
Total revenues	1,374.5	1,048.0	1,000.7
Cost of sales:
Total cost of sales	1,163.0	882.2	857.8
Commercial Vehicle Distribution and Other
Revenue:
Total revenues	561.4	514.6	444.6
Cost of sales:
Total cost of sales	$ 416.6	$ 382.7	$ 325.7