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Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) segments | Mar. 31, 2015 USD ($) segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Number of reportable segments | segments |  | 3 | 3
Total consolidated revenue |  | $ 5,119.6 | $ 4,944.2
Total segment income | [1] | 236.5 | 248.4
Corporate and other |  | (48.0) | (46.7)
Other interest expense |  | (28.3) | (21.4)
Interest income |  | 0.1 | 0.1
Other income (loss), net |  | (3.4) | 1.1
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  | 156.9 | 181.5
AN Reportable Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total consolidated revenue |  | 5,063.5 | 4,907.6
AN Reportable Segment, Domestic [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total consolidated revenue |  | 1,848.2 | 1,665.7
Total segment income | [1] | 77.4 | 79.3
AN Reportable Segment, Import [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total consolidated revenue |  | 1,675.0 | 1,678.7
Total segment income | [1] | 76.1 | 75.0
AN Reportable Segment, Premium Luxury [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total consolidated revenue |  | 1,540.3 | 1,563.2
Total segment income | [1] | 83.0 | 94.1
Corporate and Other [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total consolidated revenue |  | $ 56.1 | $ 36.6
[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, customer lead distribution business, and an auction operation, each of which generates revenues. 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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