What is the free cash flow Ratio?

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net income	$ 450	$ 396	$ 434.6
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease, net of effects from business combinations and divestitures:
Receivables	56.2	133.7	(61.6)
Inventory	296	(319.5)	39.3
Other assets	49.5	(107.9)	(37)
Increase (decrease), net of effects from business combinations and divestitures:
Vehicle floorplan payable-trade, net	(240.6)	242.4	(64.4)
Accounts payable	(17.6)	1.7	0.5
Other liabilities	(22.1)	(2)	139.1
Net cash provided by continuing operations	769.2	510.4	540.4
Net cash provided by (used in) discontinued operations	0	0.6	(0.3)
Net cash provided by operating activities	769.2	511	540.1
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of property and equipment	(269.3)	(400.8)	(313.4)
Proceeds from the sale of property and equipment	1	28	21
Proceeds from the disposal of assets held for sale	38	21.1	38
Insurance recoveries on property and equipment	3.5	1.1	1.7
Cash used in business acquisitions, net of cash acquired	(4.7)	(67.2)	(76.8)
Cash received from business divestitures, net of cash relinquished	115.6	173.2	104.6
Investment in equity security	0	(50)	0
Other	0.1	(0.7)	(2.1)