CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 375.9	$ 340.4	$ 745.4	$ 523.5
Other comprehensive income (loss):
Foreign currency translation adjustment	(120.3)	1.8	(148.8)	1.9
Unrealized gain (loss) on interest rate swaps:
Unrealized gain (loss) arising during the period, net of tax (provision) benefit of $0.0, $0.2, $0.0, and ($1.1), respectively	0.0	(0.7)	0.0	3.0
Reclassification adjustment for loss included in floor plan interest expense, net of tax benefit of $0.0, $0.1, $0.0, and $0.2, respectively	0.0	0.3	0.0	0.5
Unrealized gain (loss) on interest rate swaps, net of tax	0.0	(0.4)	0.0	3.5
Other adjustments to comprehensive income, net	5.7	6.4	4.5	7.1
Other comprehensive income (loss), net of tax	(114.6)	7.8	(144.3)	12.5
Comprehensive income	261.3	348.2	601.1	536.0
Less: Comprehensive income attributable to non-controlling interests	1.1	1.7	2.3	1.8
Comprehensive income attributable to Penske Automotive Group common stockholders	$ 260.2	$ 346.5	$ 598.8	$ 534.2