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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
segments
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Number of operating segments 3    
Number of reportable segments 3    
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues $ 15,668.8 $ 13,832.3 $ 12,461.0
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Corporate and other income and adjustments (137.9) (121.9) (106.5)
Other interest expense (86.9) (66.0) (56.1)
Loss on debt extinguishment 0 (2.2) (19.6)
Interest income 0.3 0.7 1.4
Other income (losses), net 3.6 (0.5) 1.5
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 516.8 461.3 381.3
Floorplan Interest Expense [Abstract]      
Floorplan interest expense 45.5 42.7 42.5
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization 87.3 83.7 76.8
Assets [Abstract]      
Assets 7,203.0 6,198.8 5,974.2
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]      
Capital expenditures 183.6 158.1 161.8
Operating Segments [Member]
     
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues 15,513.7 13,685.1 12,328.7
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Total segment income 737.7 [1] 651.2 [1] 560.6 [1]
Operating Segments, Domestic [Member]
     
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues 5,131.6 4,655.4 4,111.3
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Total segment income 209.4 [1] 180.0 [1] 152.7 [1]
Floorplan Interest Expense [Abstract]      
Floorplan interest expense 20.2 20.4 19.3
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization 23.0 20.7 20.3
Assets [Abstract]      
Assets 1,883.8 1,557.7 1,447.7
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]      
Capital expenditures 69.5 31.7 23.2
Operating Segments, Import [Member]
     
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues 5,828.8 4,933.3 4,582.2
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Total segment income 257.9 [1] 227.1 [1] 188.2 [1]
Floorplan Interest Expense [Abstract]      
Floorplan interest expense 14.2 11.2 12.7
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization 25.0 22.4 19.6
Assets [Abstract]      
Assets 1,769.2 1,480.0 1,481.5
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]      
Capital expenditures 55.2 60.6 39.5
Operating Segments, Premium Luxury [Member]
     
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues 4,553.3 4,096.4 3,635.2
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Total segment income 270.4 [1] 244.1 [1] 219.7 [1]
Floorplan Interest Expense [Abstract]      
Floorplan interest expense 10.7 9.7 9.2
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization 25.1 23.4 18.2
Assets [Abstract]      
Assets 1,513.8 1,285.4 1,217.1
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]      
Capital expenditures 33.1 55.5 79.5
Audi [Member]
     
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues   187.7 126.2
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]      
Total segment income   13.2 [1] 11.3 [1]
Corporate and Other [Member]
     
Segment Reporting Information, Revenue for Reportable Segment [Abstract]      
Total revenues 155.1 147.2 132.3
Floorplan Interest Expense [Abstract]      
Floorplan interest expense 0.4 1.4 1.3
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization 14.2 17.2 18.7
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]      
Capital expenditures 25.8 10.3 19.6
Corporate and Other [Member] | Goodwill [Member]
     
Assets [Abstract]      
Assets 1,237.4 1,172.2 1,142.1
Corporate and Other [Member] | Franchise rights [Member]
     
Assets [Abstract]      
Assets 285.7 212.6 199.1
Corporate and Other [Member] | Other Corporate and other assets [Member]
     
Assets [Abstract]      
Assets $ 513.1 $ 490.9 $ 486.7
[1] Segment income for each of our segments is defined as operating income less floorplan interest expense.