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Segment Information Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting [Abstract]
Total segment income for reportable segments	$ 598.4	$ 259.6	$ 1,001.3	$ 459.8
Corporate and other	(74.8)	(74.5)	(150.2)	(519.5)
Other interest expense	(20.9)	(23.2)	(42.1)	(46.7)
Other income, net	8.9	214.6	19.9	211.7
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	$ 511.6	$ 376.5	$ 828.9	$ 105.3

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

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