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Segment Informations (Details 3) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 4,921.3 | $ 4,960.1 | $ 4,920.6 | $ 4,482.9 | $ 4,425.6 | $ 4,396.7 | $ 4,384.5 | $ 4,025.2 | $ 19,284.9 | $ 17,232.0 | $ 14,482.5
Retail Automotive | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 17,896.3 | 16,657.5 | 14,329.9
Retail Automotive | Operating segments | New vehicle |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 9,208.9 | 8,698.8 | 7,528.2
Retail Automotive | Operating segments | Used vehicle |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 5,425.5 | 4,971.1 | 4,201.3
Retail Automotive | Operating segments | Finance and insurance, net |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 478.3 | 436.0 | 370.4
Retail Automotive | Operating segments | Service and parts |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,830.7 | 1,716.9 | 1,531.7
Retail Automotive | Operating segments | Fleet and wholesale |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 952.9 | 834.7 | $ 698.3
Retail Commercial Truck Dealership | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 944.1 | 125.6 |
Retail Commercial Truck Dealership | Operating segments | New vehicle |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 572.5 | 78.7 |
Retail Commercial Truck Dealership | Operating segments | Used vehicle |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 58.7 | 9.5 |
Retail Commercial Truck Dealership | Operating segments | Finance and insurance, net |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 6.7 | 0.9 |
Retail Commercial Truck Dealership | Operating segments | Service and parts |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 286.0 | 33.9 |
Retail Commercial Truck Dealership | Operating segments | Lease, rental and wholesale |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by product type |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 20.2 | $ 2.6 |

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