Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 29.8	$ 38.6
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	18.6	17.0
Change in operating lease assets	6.4	7.6
Deferred income taxes	(0.4)	4.1
Stock-based compensation	5.1	6.1
Amortization of debt discount and issue costs	1.0	0.9
(Gain) loss on disposition of assets	0.0	(5.8)
Other	0.4	0.2
Changes in assets and liabilities, net of acquisitions and dispositions:
Accounts payable and accrued expenses	(98.1)	101.6
Accounts and notes receivable	41.6	9.2
Inventories	(125.7)	(28.1)
Contracts-in-transit and vehicle receivables	135.2	5.1
Prepaid expenses and other assets	1.8	(17.7)
Floorplan notes payable — manufacturer affiliates	35.9	(2.5)
Deferred revenues	(0.2)	(0.2)
Operating lease liabilities	(7.3)	(8.4)
Net cash provided by (used in) operating activities	44.1	127.9
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from disposition of franchises, property and equipment	0.5	35.1
Purchases of property and equipment	(31.6)	(41.7)
Other	0.0	(0.2)
Net cash provided by (used in) investing activities	(31.1)	(6.8)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility — floorplan line and other	1,691.6	1,631.5
Repayments on credit facility — floorplan line and other	(1,665.6)	(1,697.5)
Borrowings on credit facility — acquisition line	30.0	107.8
Repayments on credit facility — acquisition line	(30.0)	(111.5)
Debt issue costs	(0.1)	0.0
Borrowings on other debt	27.3	20.3
Principal payments on other debt	(26.0)	(26.7)
Borrowings on debt related to real estate	18.9	0.0
Principal payments on debt related to real estate	(7.6)	(20.9)
Proceeds from employee stock purchase plan	2.5	2.1
Payment of tax withholding for stock-based awards	(5.0)	(2.9)
Repurchases of common stock, amounts based on settlement date	(48.9)	0.0
Dividends paid	(5.5)	(4.8)
Net cash provided by (used in) financing activities	(18.5)	(102.5)
Effect of exchange rate changes on cash	(3.4)	(0.5)
Net increase (decrease) in cash, cash equivalents and restricted cash	(8.9)	18.1
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	28.1	18.7
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	$ 19.2	$ 28.1