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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
segments
Sep. 30, 2013
segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Number of reportable segments     3 3
Total consolidated revenue $ 4,909.0 $ 4,470.8 $ 14,061.0 $ 12,993.7
Total segment income 237.8 [1] 211.1 [1] 684.1 [1] 624.2 [1]
Corporate and other (43.5) (36.6) (129.4) (125.9)
Other interest expense (21.7) (22.3) (64.6) (66.6)
Interest income 0.1 0.1 0.2 0.2
Other income (loss), net 1.1 (0.7) 3.5 2.2
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 173.8 151.6 493.8 434.1
AN Reportable Segments [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total consolidated revenue 4,871.4 4,434.1 13,954.8 12,875.7
AN Reportable Segment, Domestic [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total consolidated revenue 1,660.7 1,491.2 4,738.6 4,384.5
Total segment income 76.7 [1] 64.2 [1] 211.0 [1] 188.9 [1]
AN Reportable Segment, Import [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total consolidated revenue 1,787.8 1,695.5 5,055.0 4,828.5
Total segment income 77.1 [1] 72.7 [1] 220.0 [1] 216.6 [1]
AN Reportable Segment, Premium Luxury [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total consolidated revenue 1,422.9 1,247.4 4,161.2 3,662.7
Total segment income 84.0 [1] 74.2 [1] 253.1 [1] 218.7 [1]
Corporate and Other [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total consolidated revenue $ 37.6 $ 36.7 $ 106.2 $ 118.0
[1] Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.