CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Total revenues	$ 20,118.5	$ 19,284.9	$ 17,232.0
Cost of sales:
Total cost of sales	17,151.9	16,417.4	14,652.8
Gross profit	2,966.6	2,867.5	2,579.2
Selling, general and administrative expenses	2,302.0	2,223.0	2,008.6
Depreciation	89.7	78.0	70.2
Operating income	574.9	566.5	500.4
Floor plan interest expense	(50.9)	(44.5)	(46.5)
Other interest expense	(85.4)	(69.4)	(52.8)
Gain on investment			16.0
Equity in earnings of affiliates	69.5	39.3	40.8
Income from continuing operations before income taxes	508.1	491.9	457.9
Income taxes	(160.7)	(158.0)	(153.1)
Income from continuing operations	347.4	333.9	304.8
Loss from discontinued operations, net of tax	(1.0)	(3.5)	(14.7)
Net income	346.4	330.4	290.1
Less: Income attributable to non-controlling interests	3.5	4.3	3.4
Net income attributable to Penske Automotive Group common stockholders	$ 342.9	$ 326.1	$ 286.7
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 4.00	$ 3.67	$ 3.34
Discontinued operations (in dollars per share)	(0.01)	(0.04)	(0.16)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 3.99	$ 3.63	$ 3.17
Shares used in determining basic earnings per share (in shares)	86,000,754	89,759,626	90,318,839
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 4.00	$ 3.67	$ 3.34
Discontinued operations (in dollars per share)	(0.01)	(0.04)	(0.16)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 3.99	$ 3.63	$ 3.17
Shares used in determining diluted earnings per share (in shares)	86,000,754	89,759,626	90,354,839
Amounts attributable to Penske Automotive Group common stockholders:
Income from continuing operations	$ 347.4	$ 333.9	$ 304.8
Less: Income attributable to non-controlling interests	3.5	4.3	3.4
Income from continuing operations, net of tax	343.9	329.6	301.4
Loss from discontinued operations, net of tax	(1.0)	(3.5)	(14.7)
Net income attributable to Penske Automotive Group common stockholders	$ 342.9	$ 326.1	$ 286.7
Cash dividends per share (in dollars per share)	$ 1.1	$ 0.94	$ 0.78
Retail Automotive Dealership
Revenue:
Total revenues	$ 18,673.2	$ 17,896.3	$ 16,657.5
Cost of sales:
Total cost of sales	15,968.4	15,288.3	14,180.1
Retail Commercial Truck Dealership
Revenue:
Total revenues	1,000.7	944.1	125.6
Cost of sales:
Total cost of sales	857.8	797.1	104.5
Commercial Vehicle Distribution and Other
Revenue:
Total revenues	444.6	444.5	448.9
Cost of sales:
Total cost of sales	$ 325.7	$ 332.0	$ 368.2