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Segment Information - Revenue by product type (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue from external customers by product type                      
Total revenues $ 4,887.8 $ 5,152.0 $ 5,254.1 $ 4,824.6 $ 4,921.3 $ 4,960.1 $ 4,920.6 $ 4,482.9 $ 20,118.5 $ 19,284.9 $ 17,232.0
Retail Automotive Dealership                      
Revenue from external customers by product type                      
Total revenues                 18,673.2 17,896.3 16,657.5
Retail Automotive Dealership | Operating segments                      
Revenue from external customers by product type                      
Total revenues                 18,673.2 17,896.3 16,657.5
Retail Automotive Dealership | Operating segments | New vehicle                      
Revenue from external customers by product type                      
Total revenues                 9,547.1 9,208.9 8,698.8
Retail Automotive Dealership | Operating segments | Used vehicle                      
Revenue from external customers by product type                      
Total revenues                 5,663.7 5,425.5 4,971.1
Retail Automotive Dealership | Operating segments | Finance and insurance, net                      
Revenue from external customers by product type                      
Total revenues                 495.0 478.3 436.0
Retail Automotive Dealership | Operating segments | Service and parts                      
Revenue from external customers by product type                      
Total revenues                 1,948.6 1,830.7 1,716.9
Retail Automotive Dealership | Operating segments | Fleet and wholesale                      
Revenue from external customers by product type                      
Total revenues                 1,018.8 952.9 834.7
Retail Commercial Truck Dealership                      
Revenue from external customers by product type                      
Total revenues                 1,000.7 944.1 125.6
Retail Commercial Truck Dealership | Operating segments                      
Revenue from external customers by product type                      
Total revenues                 1,000.7 944.1 125.6
Retail Commercial Truck Dealership | Operating segments | New vehicle                      
Revenue from external customers by product type                      
Total revenues                 625.5 572.5 78.7
Retail Commercial Truck Dealership | Operating segments | Used vehicle                      
Revenue from external customers by product type                      
Total revenues                 51.8 58.7 9.5
Retail Commercial Truck Dealership | Operating segments | Finance and insurance, net                      
Revenue from external customers by product type                      
Total revenues                 7.3 6.7 0.9
Retail Commercial Truck Dealership | Operating segments | Service and parts                      
Revenue from external customers by product type                      
Total revenues                 306.0 286.0 33.9
Retail Commercial Truck Dealership | Operating segments | Lease, rental and wholesale                      
Revenue from external customers by product type                      
Total revenues                 $ 10.1 $ 20.2 $ 2.6