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Segment Information Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting [Abstract] |  |
Total segment income for reportable segments | $ 402.9 | $ 200.2
Corporate and other | (75.4) | (445.0)
Other interest expense | (21.2) | (23.5)
Other income (loss), net | 11.0 | (2.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | $ 317.3 | $ (271.2)

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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. + References No definition available. + Details
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