CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities:
Net income	$ 435.1	$ 470.3	$ 612.8
Adjustments to reconcile net income to net cash from continuing operating activities:
Depreciation	109.6	103.7	95.1
Earnings of equity method investments	(94.6)	(89.0)	(68.9)
(Income) loss from discontinued operations, net of tax	(0.3)	(0.5)	0.2
Deferred income taxes	92.0	105.9	(108.7)
Changes in operating assets and liabilities:
Accounts receivable	(30.9)	30.4	(73.1)
Inventories	(117.8)	(12.6)	(419.9)
Floor plan notes payable	83.9	27.4	276.3
Accounts payable and accrued expenses	71.4	(17.1)	272.0
Other	(30.1)	(4.3)	37.2
Net cash provided by continuing operating activities	518.3	614.2	623.0
Investing Activities:
Purchase of equipment and improvements	(245.3)	(305.6)	(247.0)
Proceeds from sale of dealerships	22.8	84.5	25.1
Proceeds from sale-leaseback transactions	18.9	10.7	22.2
Acquisition of additional ownership interest in Penske Truck Leasing			(239.1)
Acquisitions net, including repayment of sellers' floor plan notes payable of $138.5, $58.2, and $101.6, respectively	(326.9)	(309.1)	(449.7)
Other	(2.2)	(5.7)	(40.2)
Net cash used in continuing investing activities	(532.7)	(525.2)	(928.7)
Financing Activities:
Proceeds from borrowings under U.S. credit agreement revolving credit line	1,808.0	1,642.0	2,040.0
Repayments under U.S. credit agreement revolving credit line	(1,793.0)	(1,784.0)	(2,108.0)
Issuance of 3.75% senior subordinated notes			300.0
Net borrowings of other long-term debt	115.4	235.5	42.0
Net borrowings of floor plan notes payable - non-trade	177.5	10.0	185.3
Payment of debt issuance costs	(0.4)	(1.9)	(4.0)
Repurchases of common stock	(169.2)	(68.9)	(18.5)
Dividends	(130.8)	(121.2)	(108.4)
Other	(4.9)	(5.8)	(5.8)
Net cash used in continuing financing activities	2.6	(94.3)	322.6
Discontinued operations:
Net cash provided by discontinued operating activities	0.3	0.5	0.5
Net cash provided by discontinued investing activities			2.4
Net cash provided by discontinued financing activities			(0.2)
Net cash provided by discontinued operations	0.3	0.5	2.7
Effect of exchange rate changes on cash and cash equivalents	0.2	(1.5)	2.1
Net change in cash and cash equivalents	(11.3)	(6.3)	21.7
Cash and cash equivalents, beginning of period	39.4	45.7	24.0
Cash and cash equivalents, end of period	28.1	39.4	45.7
Cash paid for:
Interest	204.9	190.2	163.2
Income taxes	92.4	39.6	(29.7)
Seller financed/assumed debt			0.8
Non cash activities:
Deferred consideration		$ 6.8
Consideration transferred through common stock issuance			32.4
Contingent consideration	$ 10.6		$ 20.0