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Segment Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) segments | Dec. 31, 2016 USD ($) segments | Dec. 31, 2015 USD ($) segments
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segments |  | 3 | 3 | 3
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |
Total revenues |  | $ 21,534.6 | $ 21,609.0 | $ 20,862.0
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |
Total segment income | [1] | 909.0 | 958.1 | 1,024.5
Corporate and other |  | (162.6) | (145.1) | (209.7)
Other interest expense |  | (120.2) | (115.5) | (90.9)
Interest income |  | 1.0 | 1.1 | 0.1
Other income (loss), net |  | 9.3 | 3.7 | (1.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  | 636.5 | 702.3 | 722.7
Floorplan Interest Expense [Abstract] |  |  |  |
Floorplan interest expense |  | 97.0 | 76.5 | 58.3
Depreciation, Depletion and Amortization [Abstract] |  |  |  |
Depreciation and amortization |  | 158.6 | 143.4 | 127.4
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |
Capital expenditures |  | 332.9 | 253.2 | 266.9
Assets [Abstract] |  |  |  |
Assets |  | 10,271.5 | 10,060.0 | 9,548.2
AN Reportable Segments [Member] |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |
Total revenues |  | 21,158.9 | 21,361.4 | 20,714.8
AN Reportable Segment, Domestic [Member] |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |
Total revenues |  | 7,452.8 | 7,810.0 | 7,069.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |
Total segment income | [1] | 257.1 | 311.1 | 336.9
Floorplan Interest Expense [Abstract] |  |  |  |
Floorplan interest expense |  | 40.9 | 33.7 | 24.1
Depreciation, Depletion and Amortization [Abstract] |  |  |  |
Depreciation and amortization |  | 38.2 | 37.5 | 31.0
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |
Capital expenditures |  | 36.2 | 62.5 | 61.4
Assets [Abstract] |  |  |  |
Assets |  | 2,563.9 | 2,742.8 | 2,573.9
AN Reportable Segment, Import [Member] |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |
Total revenues |  | 6,873.4 | 6,886.1 | 7,037.2
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |
Total segment income | [1] | 303.1 | 296.8 | 311.4
Floorplan Interest Expense [Abstract] |  |  |  |
Floorplan interest expense |  | 23.2 | 17.4 | 15.0
Depreciation, Depletion and Amortization [Abstract] |  |  |  |
Depreciation and amortization |  | 34.3 | 35.4 | 32.9
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |
Capital expenditures |  | 32.8 | 28.0 | 34.0
Assets [Abstract] |  |  |  |
Assets |  | 1,992.6 | 2,065.5 | 2,145.2
AN Reportable Segment, Premium Luxury [Member] |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |
Total revenues |  | 6,832.7 | 6,665.3 | 6,607.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |
Total segment income | [1] | 348.8 | 350.2 | 376.2
Floorplan Interest Expense [Abstract] |  |  |  |
Floorplan interest expense |  | 28.4 | 22.7 | 18.0
Depreciation, Depletion and Amortization [Abstract] |  |  |  |
Depreciation and amortization |  | 44.5 | 40.7 | 35.0
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |
Capital expenditures |  | 101.7 | 95.6 | 101.9
Assets [Abstract] |  |  |  |
Assets |  | 2,716.8 | 2,603.4 | 2,554.6
Corporate and Other [Member] |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |
Total revenues |  | 375.7 | 247.6 | 147.2
Floorplan Interest Expense [Abstract] |  |  |  |
Floorplan interest expense |  | 4.5 | 2.7 | 1.2
Depreciation, Depletion and Amortization [Abstract] |  |  |  |
Depreciation and amortization |  | 41.6 | 29.8 | 28.5
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |
Capital expenditures |  | 162.2 | 67.1 | 69.6
Corporate and Other [Member] | Goodwill [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets |  | 1,515.0 | 1,511.3 | 1,394.5
Corporate and Other [Member] | Franchise Rights [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets |  | 572.2 | 589.4 | 432.4
Corporate and Other [Member] | Other Corporate and Other Assets [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets |  | $ 911.0 | $ 547.6 | $ 447.6
[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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