CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net income	$ 612.8	$ 346.4	$ 330.4
Adjustments to reconcile net income to net cash from continuing operating activities:
Depreciation	95.1	89.7	78.0
Earnings of equity method investments	(68.9)	(50.0)	(28.0)
Loss from discontinued operations, net of tax	0.2	1.0	3.5
Deferred income taxes	(108.7)	162.2	44.6
Changes in operating assets and liabilities:
Accounts receivable	(73.1)	(92.5)	(23.5)
Inventories	(419.9)	130.4	(428.4)
Floor plan notes payable	276.3	(162.8)	360.8
Accounts payable and accrued expenses	272.0	(17.8)	66.0
Other	37.2	(35.3)	(5.6)
Net cash provided by continuing operating activities	623.0	371.3	397.8
Investing Activities:
Purchase of equipment and improvements	(247.0)	(203.1)	(199.5)
Proceeds from sale-leaseback transactions	22.2
Acquisition of additional ownership interest in Penske Truck Leasing	(239.1)	(498.5)
Acquisitions net, including repayment of sellers’ floor plan notes payable of $101.6, $62.2 and $60.3, respectively	(449.7)	(140.8)	(156.9)
Other	(15.1)	5.7	4.7
Net cash used in continuing investing activities	(928.7)	(836.7)	(351.7)
Financing Activities:
Proceeds from borrowings under U.S. credit agreement revolving credit line	2,040.0	1,476.5	1,420.4
Repayments under U.S. credit agreement revolving credit line	(2,108.0)	(1,396.5)	(1,260.4)
Repayment of U.S. credit agreement term loan			(88.0)
Repayment of U.S. commercial truck capital loan			(60.5)
Net borrowings (repayments) of other long-term debt	42.0	42.9	(73.6)
Net borrowings of floor plan notes payable — non-trade	185.3	101.0	154.2
Payment of debt issuance costs	(4.0)	(6.7)	(1.8)
Repurchases of common stock	(18.5)	(173.6)	(48.9)
Dividends	(108.4)	(95.1)	(84.8)
Other	(5.8)	(15.5)	(12.2)
Net cash provided by (used in) continuing financing activities	322.6	433.0	(55.6)
Discontinued operations:
Net cash provided by (used in) discontinued operating activities	0.5	1.6	(5.5)
Net cash provided by discontinued investing activities	2.4	1.7	129.6
Net cash used in discontinued financing activities	(0.2)	(0.2)	(87.1)
Net cash provided by discontinued operations	2.7	3.1	37.0
Effect of exchange rate changes on cash and cash equivalents	2.1	(9.1)	(1.4)
Net change in cash and cash equivalents	21.7	(38.4)	26.1
Cash and cash equivalents, beginning of period	24.0	62.4	36.3
Cash and cash equivalents, end of period	45.7	24.0	62.4
Cash paid (received) for:
Interest	163.2	129.8	110.1
Income taxes	(29.7)	48.6	114.9
Seller financed/assumed debt	0.8		$ 2.6
Non cash activities:
Consideration transferred through common stock issuance	32.4
Contingent consideration	20.0
3.75% senior subordinated notes due 2020
Financing Activities:
Issuance of senior subordinated notes	$ 300.0
5.50% senior subordinated notes due 2026
Financing Activities:
Issuance of senior subordinated notes		$ 500.0