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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

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