CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Total revenues	$ 5,940.3	$ 5,383.4	$ 11,687.2	$ 10,464.5
Cost of sales:
Total cost of sales	5,050.5	4,566.1	9,933.0	8,872.9
Gross profit	889.8	817.3	1,754.2	1,591.6
Selling, general and administrative expenses	675.4	622.0	1,338.5	1,223.7
Depreciation	25.7	23.3	51.3	45.7
Operating income	188.7	172.0	364.4	322.2
Floor plan interest expense	(19.9)	(15.5)	(38.8)	(29.2)
Other interest expense	(28.6)	(26.4)	(58.4)	(51.4)
Equity in earnings of affiliates	36.0	26.8	53.3	40.0
Income from continuing operations before income taxes	176.2	156.9	320.5	281.6
Income taxes	(41.0)	(50.2)	(77.6)	(91.3)
Income from continuing operations	135.2	106.7	242.9	190.3
Income (loss) from discontinued operations, net of tax		0.2	0.1	(0.4)
Net income	135.2	106.9	243.0	189.9
Less: Income attributable to non-controlling interests	0.6	0.7	0.3	1.1
Net income attributable to Penske Automotive Group common stockholders	$ 134.6	$ 106.2	$ 242.7	$ 188.8
Basic earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 1.59	$ 1.23	$ 2.84	$ 2.20
Discontinued operations (in dollars per share)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 1.59	$ 1.23	$ 2.84	$ 2.20
Shares used in determining basic earnings per share (in shares)	84.9	86.1	85.4	85.9
Diluted earnings per share attributable to Penske Automotive Group common stockholders:
Continuing operations (in dollars per share)	$ 1.58	$ 1.23	$ 2.84	$ 2.20
Discontinued operations (in dollars per share)
Net income attributable to Penske Automotive Group common stockholders (in dollars per share)	$ 1.58	$ 1.23	$ 2.84	$ 2.20
Shares used in determining diluted earnings per share (in shares)	85.0	86.1	85.5	85.9
Amounts attributable to Penske Automotive Group common stockholders:
Income from continuing operations	$ 135.2	$ 106.7	$ 242.9	$ 190.3
Less: Income attributable to non-controlling interests	0.6	0.7	0.3	1.1
Income from continuing operations, net of tax	134.6	106.0	242.6	189.2
Income (loss) from discontinued operations, net of tax		0.2	0.1	(0.4)
Net income attributable to Penske Automotive Group common stockholders	$ 134.6	$ 106.2	$ 242.7	$ 188.8
Cash dividends per share (in dollars per share)	$ 0.35	$ 0.31	$ 0.69	$ 0.61
Retail Automotive Dealership
Revenue:
Total revenues	$ 5,455.5	$ 5,040.7	$ 10,751.5	$ 9,797.1
Cost of sales:
Total cost of sales	4,657.5	4,294.7	9,175.2	8,342.8
Retail Commercial Truck Dealership
Revenue:
Total revenues	338.8	228.5	631.2	440.2
Cost of sales:
Total cost of sales	286.4	188.5	532.2	363.8
Commercial Vehicle Distribution and Other
Revenue:
Total revenues	146.0	114.2	304.5	227.2
Cost of sales:
Total cost of sales	$ 106.6	$ 82.9	$ 225.6	$ 166.3