CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$ 77.0	$ 67.3
Adjustments to reconcile net income to net cash provided by operating activities—
Depreciation and amortization	14.5	12.7
Stock-based compensation	5.3	4.3
Deferred income taxes	0.1	1.9
Loaner vehicle amortization	8.6	6.3
Excess tax benefit on share-based arrangements	(4.5)	(3.3)
Loss on disposal of fixed assets	0.5	0.7
Other adjustments, net	1.3	0.7
Changes in operating assets and liabilities, net of acquisitions and divestitures—
Contracts-in-transit	8.9	9.3
Accounts receivable	7.6	(2.7)
Proceeds from the sale of accounts receivable	0.0	2.5
Inventories	11.6	16.0
Other current assets	(57.0)	(36.0)
Floor plan notes payable—trade	(5.9)	(10.7)
Accounts payable and accrued liabilities	19.3	12.6
Other long-term assets and liabilities, net	1.9	(0.9)
Net cash provided by operating activities	89.2	80.7
CASH FLOW FROM INVESTING ACTIVITIES:
Capital expenditures—excluding real estate	(19.9)	(31.3)
Capital expenditures—real estate	(22.4)	0.0
Capital expenditures—capitalized interest	(0.1)	(0.6)
Acquisitions	67.4	21.9
Proceeds from the sale of assets	2.3	0.0
Net cash used in investing activities	(107.5)	(53.8)
CASH FLOW FROM FINANCING ACTIVITIES:
Floor plan borrowings—non-trade	2,090.0	1,627.5
Floor plan borrowings—acquisitions	16.7	6.5
Floor plan repayments—non-trade	(2,006.3)	(1,622.1)
Proceeds from borrowings	82.9	0.0
Repayments of borrowings	(5.8)	(4.9)
Payment of debt issuance costs	(1.3)	0.0
Repurchases of common stock, including those associated with net share settlement of employee share-based awards	(163.4)	(35.6)
Excess tax benefit on share-based arrangements	4.5	3.3
Net cash provided by (used in) financing activities	17.3	(25.3)
Net (decrease) increase in cash and cash equivalents	(1.0)	1.6
CASH AND CASH EQUIVALENTS, beginning of period	2.9	5.4
CASH AND CASH EQUIVALENTS, end of period	$ 1.9	$ 7.0