CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income	$ 290.1us-gaap_ProfitLoss	$ 245.7us-gaap_ProfitLoss	$ 187.2us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash from continuing operating activities:
Depreciation	70.0us-gaap_Depreciation	59.6us-gaap_Depreciation	52.2us-gaap_Depreciation
Gain on investment	(16.0)
Earnings of equity method investments	(28.8)	(23.0)	(18.6)
Loss from discontinued operations, net of tax	18.7	4.6	9.0
Deferred income taxes	50.5us-gaap_DeferredIncomeTaxExpenseBenefit	77.6us-gaap_DeferredIncomeTaxExpenseBenefit	83.8us-gaap_DeferredIncomeTaxExpenseBenefit
Debt redemption costs			17.8us-gaap_GainLossOnSaleOfDebtInvestments
Changes in operating assets and liabilities:
Accounts receivable	(37.9)us-gaap_IncreaseDecreaseInReceivables	(34.4)us-gaap_IncreaseDecreaseInReceivables	(86.0)us-gaap_IncreaseDecreaseInReceivables
Inventories	(115.5)	(388.2)	(311.6)
Floor plan notes payable	140.7	290.6	400.1
Accounts payable and accrued expenses	14.6	76.9	12.0
Other	(20.1)	(8.4)	(20.2)
Net cash provided by continuing operating activities	366.3	301.0	325.7
Investing Activities:
Purchase of equipment and improvements	(174.8)	(174.7)	(150.9)
Proceeds from sale-leaseback transactions			1.6
Acquisitions net, including repayment of sellers' floor plan notes payable of $117.8, $29.6 and $74.9, respectively	(355.0)	(314.0)	(233.3)
Other	(22.6)	(2.6)	8.8
Net cash used in continuing investing activities	(552.4)	(491.3)	(373.8)
Financing Activities:
Proceeds from borrowings under U.S. credit agreement revolving credit line	1,272.6	1,102.8	761.3
Repayments under U.S. credit agreement revolving credit line	(1,362.6)	(1,062.8)	(843.3)
Repayments under U.S. credit agreement term loan	(10.0)us-gaap_RepaymentsOfSecuredDebt	(12.0)us-gaap_RepaymentsOfSecuredDebt	(17.0)us-gaap_RepaymentsOfSecuredDebt
Repurchase of 7.75% senior subordinated notes			(390.8)us-gaap_RepaymentsOfSubordinatedDebt
Repurchase of 3.5% senior subordinated convertible notes			(62.7)us-gaap_RepaymentsOfConvertibleDebt
Net borrowings of other long-term debt	28.7	53.1	47.3
Net borrowings of floor plan notes payable - non-trade	19.6	191.2	70.2
Payment of deferred financing fees	(4.4)us-gaap_PaymentsOfFinancingCosts		(8.6)us-gaap_PaymentsOfFinancingCosts
Repurchases of common stock	(15.5)	(15.8)	(9.8)
Dividends	(70.5)us-gaap_PaymentsOfDividendsCommonStock	(56.0)us-gaap_PaymentsOfDividendsCommonStock	(41.5)us-gaap_PaymentsOfDividendsCommonStock
Other	0.3	0.2	(1.1)
Net cash provided by continuing financing activities	158.2	200.7	54.0
Discontinued operations:
Net cash provided by discontinued operating activities	0.3	18.8	0.4
Net cash provided by (used in) discontinued investing activities	19.8	(66.8)	3.1
Net cash (used in) provided by discontinued financing activities	(4.9)	44.0	7.7
Net cash provided by (used in) discontinued operations	15.2	(4.0)	11.2
Effect of exchange rate changes on cash and cash equivalents	(1.3)
Net change in cash and cash equivalents	(14.0)	6.4	17.1
Cash and cash equivalents, beginning of period	50.3	43.9	26.8
Cash and cash equivalents, end of period	36.3	50.3	43.9
Cash paid for:
Interest	98.4us-gaap_InterestPaid	92.2us-gaap_InterestPaid	76.3us-gaap_InterestPaid
Income taxes	114.3us-gaap_IncomeTaxesPaidNet	33.5us-gaap_IncomeTaxesPaidNet	41.9us-gaap_IncomeTaxesPaidNet
Seller financed/assumed debt	136.4
5.75% senior subordinated notes due 2022
Financing Activities:
Issuance of senior subordinated notes			550.0
5.375% senior subordinated notes due 2024
Financing Activities:
Issuance of senior subordinated notes	$ 300.0

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The net change during the reporting periods of floor plan notes payable with the manufacturer of new vehicles.

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The cash inflow from the assets sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale.

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