CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,058.6	$ 1,386.2	$ 1,192.7
Other comprehensive income (loss):
Foreign currency translation adjustment	66.1	(154.6)	(39.8)
Unrealized gain on interest rate swaps:
Unrealized gain arising during the period, net of tax provision of $0.0, $0.0, and $1.2, respectively	0.0	0.0	4.4
Reclassification adjustment for gain included in floor plan interest expense, net of tax provision of $0.0, $0.0, and $0.3, respectively	0.0	0.0	(1.2)
Unrealized gain on interest rate swaps, net of tax	0.0	0.0	3.2
Other adjustments to comprehensive income, net	5.7	(12.8)	27.5
Other comprehensive income (loss), net of tax	71.8	(167.4)	(9.1)
Comprehensive income	1,130.4	1,218.8	1,183.6
Less: Comprehensive income attributable to non-controlling interests	6.0	5.3	4.0
Comprehensive income attributable to Penske Automotive Group common stockholders	$ 1,124.4	$ 1,213.5	$ 1,179.6