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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 segments | Dec. 31, 2012 segments | Dec. 31, 2011 segments
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of operating segments | 3 |  | 3 |  | 3 |
Number of reportable segments | 3 |  | 3 |  | 3 |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |
Total revenues | $ 17,517.6 |  | $ 15,667.5 |  | $ 13,832.3 |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |
Total segment income | 848.1 | [1] | 737.7 | [1] | 651.2 | [1]
Corporate and other | (161.2) |  | (137.9) |  | (121.9) |
Other interest expense | (88.3) |  | (86.9) |  | (66.0) |
Loss on debt extinguishment | 0 |  | 0 |  | (2.2) |
Interest income | 0.2 |  | 0.3 |  | 0.7 |
Other income (losses), net | 5.6 |  | 3.6 |  | (0.5) |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 604.4 |  | 516.8 |  | 461.3 |
Floorplan Interest Expense [Abstract] |  |  |  |  |  |
Floorplan interest expense | 53.4 |  | 45.5 |  | 42.7 |
Depreciation, Depletion and Amortization [Abstract] |  |  |  |  |  |
Depreciation and amortization | 95.3 |  | 87.3 |  | 83.7 |
Assets [Abstract] |  |  |  |  |  |
Assets | 7,914.1 |  | 7,203.0 |  | 6,198.8 |
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |  |  |
Capital expenditures | 207.2 |  | 183.6 |  | 158.1 |
Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |
Total revenues | 17,362.6 |  | 15,512.4 |  | 13,685.1 |
Operating Segments, Domestic [Member] |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |
Total revenues | 5,835.3 |  | 5,131.6 |  | 4,655.4 |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |
Total segment income | 246.6 | [1] | 209.4 | [1] | 180.0 | [1]
Floorplan Interest Expense [Abstract] |  |  |  |  |  |
Floorplan interest expense | 23.7 |  | 20.2 |  | 20.4 |
Depreciation, Depletion and Amortization [Abstract] |  |  |  |  |  |
Depreciation and amortization | 25.1 |  | 23.0 |  | 20.7 |
Assets [Abstract] |  |  |  |  |  |
Assets | 2,143.1 |  | 1,895.0 |  | 1,539.1 |
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |  |  |
Capital expenditures | 61.9 |  | 69.5 |  | 31.7 |
Operating Segments, Import [Member] |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |
Total revenues | 6,375.0 |  | 5,827.5 |  | 4,933.3 |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |
Total segment income | 280.1 | [1] | 257.9 | [1] | 227.1 | [1]
Floorplan Interest Expense [Abstract] |  |  |  |  |  |
Floorplan interest expense | 16.3 |  | 14.2 |  | 11.2 |
Depreciation, Depletion and Amortization [Abstract] |  |  |  |  |  |
Depreciation and amortization | 28.1 |  | 25.0 |  | 22.4 |
Assets [Abstract] |  |  |  |  |  |
Assets | 2,030.4 |  | 1,787.4 |  | 1,487.6 |
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |  |  |
Capital expenditures | 76.1 |  | 55.2 |  | 60.6 |
Operating Segments, Premium Luxury [Member] |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |
Total revenues | 5,152.3 |  | 4,553.3 |  | 4,096.4 |
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract] |  |  |  |  |  |
Total segment income | 321.4 | [1] | 270.4 | [1] | 244.1 | [1]
Floorplan Interest Expense [Abstract] |  |  |  |  |  |
Floorplan interest expense | 12.6 |  | 10.7 |  | 9.7 |
Depreciation, Depletion and Amortization [Abstract] |  |  |  |  |  |
Depreciation and amortization | 26.9 |  | 25.1 |  | 23.4 |
Assets [Abstract] |  |  |  |  |  |
Assets | 1,633.6 |  | 1,541.6 |  | 1,295.0 |
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |  |  |
Capital expenditures | 45.5 |  | 33.1 |  | 55.5 |
Corporate and Other [Member] |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |  |  |  |  |  |
Total revenues | 155.0 |  | 155.1 |  | 147.2 |
Floorplan Interest Expense [Abstract] |  |  |  |  |  |
Floorplan interest expense | 0.8 |  | 0.4 |  | 1.4 |
Depreciation, Depletion and Amortization [Abstract] |  |  |  |  |  |
Depreciation and amortization | 15.2 |  | 14.2 |  | 17.2 |
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract] |  |  |  |  |  |
Capital expenditures | 23.7 |  | 25.8 |  | 10.3 |
Goodwill [Member] | Corporate and Other [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Assets | 1,259.6 |  | 1,237.4 |  | 1,172.2 |
Franchise rights [Member] | Corporate and Other [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Assets | 329.3 |  | 285.7 |  | 212.6 |
Other Corporate and Other Assets [Member] | Corporate and Other [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Assets | $ 518.1 |  | $ 455.9 |  | $ 492.3 |
[1] | Segment income for each of our segments is defined as operating income less floorplan interest expense.

X
- 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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