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Segment Information (Reconciliation) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting [Abstract]
Total segment income for reportable segments	[1]	$ 300.4	$ 510.3	$ 676.0	$ 1,016.0
Corporate and other		(79.3)	(103.9)	(164.0)	(193.4)
Other interest expense		(46.8)	(46.0)	(91.4)	(87.1)
Other income (loss), net		(0.1)	4.4	6.9	9.6
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		$ 174.2	$ 364.8	$ 427.5	$ 745.1
[1] (1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

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- 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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