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Segment Information Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Total segment income for reportable segments	$ 242.6	$ 230.1	$ 455.7	$ 450.9
Corporate and other	(76.5)	(71.3)	(137.8)	(134.6)
Other interest expense	(27.7)	(29.7)	(55.5)	(62.0)
Interest income	0.1	0.3	0.3	0.5
Other income (loss), net	(0.3)	0.2	1.6	1.0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	$ 138.2	$ 129.6	$ 264.3	$ 255.8

X

- Definition

Operating income related to other businesses, including collision centers, AutoNation USA stand-alone used vehicle sales and service centers, and automotive auctions, all of which generate revenues but do not meet the quantitative thresholds for determining reportable segments. Amount also includes unallocated corporate overhead expenses, floorplan interest expense on used floorplan facilities, and retrospective commissions.

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Represents operating income less floorplan interest expense for each of the reportable segments.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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