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Segment Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) item | Jun. 30, 2015 USD ($)
Segment Reporting Information |  |  |  |
Number of reportable Segments | item |  |  | 3 |
Number of geographic operating segments | item |  |  | 4 |
Revenues and segment income by reportable segment |  |  |  |
Revenues | $ 5,254.1 | $ 4,920.6 | $ 10,078.7 | $ 9,403.5
Segment income | 143.5 | 143.5 | 263.1 | 259.1
Intersegment Elimination |  |  |  |
Revenues and segment income by reportable segment |  |  |  |
Revenues | (0.7) | (0.3) | (1.7) | (0.6)
Retail Automotive | Operating segments |  |  |  |
Revenues and segment income by reportable segment |  |  |  |
Revenues | 4,836.8 | 4,554.9 | 9,349.7 | 8,741.7
Segment income | 123.1 | 120.3 | 233.5 | 223.1
Retail Commercial Truck Dealership | Operating segments |  |  |  |
Revenues and segment income by reportable segment |  |  |  |
Revenues | 309.5 | 241.9 | 516.2 | 434.6
Segment income | 7.6 | 10.4 | 13.4 | 17.8
Other | Operating segments |  |  |  |
Revenues and segment income by reportable segment |  |  |  |
Revenues | 108.5 | 124.1 | 214.5 | 227.8
Segment income | $ 12.8 | $ 12.8 | $ 16.2 | $ 18.2

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