Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income	$ 418.7us-gaap_NetIncomeLoss	$ 374.9us-gaap_NetIncomeLoss	$ 316.4us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Loss from discontinued operations	1.1	0.9	0.9
Depreciation and amortization	106.9	95.3	87.3
Amortization of debt issuance costs and accretion of debt discounts	5.7	5.7	5.6
Stock-based compensation expense	26.3us-gaap_ShareBasedCompensation	21.3us-gaap_ShareBasedCompensation	18.6us-gaap_ShareBasedCompensation
Franchise rights impairment	0	0	4.2
Non-cash impairment charges	1.1us-gaap_TangibleAssetImpairmentCharges	0.7us-gaap_TangibleAssetImpairmentCharges	0.8us-gaap_TangibleAssetImpairmentCharges
Write-off of deferred debt issuance costs	0.4	0	0
Net gain on asset sales and dispositions	(13.8)us-gaap_GainLossOnDispositionOfAssets1	(9.8)us-gaap_GainLossOnDispositionOfAssets1	(0.3)us-gaap_GainLossOnDispositionOfAssets1
Deferred income tax provision	9.5	9.9	26.8
Excess tax benefit from stock-based awards	(18.0)	(10.0)	(10.6)
Other	(2.0)us-gaap_OtherNoncashIncomeExpense	(6.8)us-gaap_OtherNoncashIncomeExpense	(4.0)us-gaap_OtherNoncashIncomeExpense
(Increase) decrease, net of effects from business combinations and divestitures:
Receivables	(80.3)	(46.3)	(112.0)
Inventory	(27.3)us-gaap_IncreaseDecreaseInInventories	(400.1)us-gaap_IncreaseDecreaseInInventories	(474.7)us-gaap_IncreaseDecreaseInInventories
Other assets	(41.1)	(21.5)	(35.8)
Increase (decrease), net of effects from business combinations and divestitures:
Vehicle floorplan payable-trade, net	(27.2)	364.2	404.0
Accounts payable	7.5	36.7	30.4
Other liabilities	118.7	63.8	60.0
Net cash provided by continuing operations	486.2	478.9	317.6
Net cash provided by (used in) discontinued operations	(1.1)	5.2	(1.0)
Net cash provided by operating activities	485.1	484.1	316.6
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property and equipment	(209.2)	(160.8)	(160.6)
Property operating lease buy-outs	(0.4)	(41.9)	(16.8)
Proceeds from the sale of property and equipment	5.5	3.1	0.6
Proceeds from the disposal of assets held for sale	2.6	22.7	15.3
Insurance recoveries on property and equipment	0	2.5	1.0
Cash used in business acquisitions, net of cash acquired	(205.2)	(87.9)	(141.6)
Cash received from business divestitures, net of cash relinquished	41.4	10.1	6.8
Proceeds from the sale of restricted investments	0.5	0	0.4
Other	(11.2)	(5.6)	(2.9)
Net cash used in continuing operations	(376.0)	(257.8)	(297.8)
Net cash used in discontinued operations	0	0	0
Net cash used in investing activities	(376.0)	(257.8)	(297.8)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Repurchases of common stock	(487.7)	(67.3)	(575.6)
Proceeds from 5.5% Senior Notes due 2020	0	0	350.0
Payment of term loan facility	(500.0)us-gaap_RepaymentsOfUnsecuredDebt	0us-gaap_RepaymentsOfUnsecuredDebt	0us-gaap_RepaymentsOfUnsecuredDebt
Payment of 7% Senior Notes due 2014	0us-gaap_EarlyRepaymentOfSeniorDebt	0us-gaap_EarlyRepaymentOfSeniorDebt	(14.7)us-gaap_EarlyRepaymentOfSeniorDebt
Proceeds from revolving credit facilities	2,780.0	815.0	1,280.0
Payments of revolving credit facilities	(1,970.0)	(1,055.0)	(1,235.0)
Payment of debt issuance costs	(6.0)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(6.0)us-gaap_PaymentsOfDebtIssuanceCosts
Net proceeds from vehicle floorplan payable - non-trade	61.6	89.0	138.1
Payments of mortgage facilities	(9.2)us-gaap_RepaymentsOfFirstMortgageBond	(8.7)us-gaap_RepaymentsOfFirstMortgageBond	(8.1)us-gaap_RepaymentsOfFirstMortgageBond
Payments of capital lease and other debt obligations	(24.7)	(26.2)	(5.0)
Proceeds from the exercise of stock options	35.1	22.7	30.6
Excess tax benefit from stock-based awards	18.0	10.0	10.6
Net cash used in continuing operations	(102.9)	(220.5)	(35.1)
Net cash used in discontinued operations	0	(6.3)	(0.6)
Net cash used in financing activities	(102.9)	(226.8)	(35.7)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	6.2	(0.5)	(16.9)
CASH AND CASH EQUIVALENTS at beginning of period	69.2	69.7	86.6
CASH AND CASH EQUIVALENTS at end of period	$ 75.4	$ 69.2	$ 69.7

The aggregate expense recognized in the current period that reflects the allocation of the cost of tangible assets and intangible assets over the assets' useful lives. This concept does not include the amortization of debt financing costs and discounts.

No definition available.