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Segment Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) item | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information |  |  |  |  |
Number of reportable Segments | item |  |  | 4 |  |
Number of operating segments | item |  |  | 6 |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | $ 5,383.4 | $ 5,254.1 | $ 10,464.5 | $ 10,078.7 |
Segment income | 156.9 | 143.5 | 281.6 | 263.1 |
Intersegment Elimination |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues |  | (0.7) |  | (1.7) |
Retail Automotive Dealership |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 5,040.7 | 4,836.8 | 9,797.1 | 9,349.7 | $ 18,700.0
Retail Automotive Dealership | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 5,040.7 | 4,836.8 | 9,797.1 | 9,349.7 |
Segment income | 120.8 | 123.1 | 225.6 | 233.5 |
Retail Commercial Truck Dealership |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 228.5 | 309.5 | 440.2 | 516.2 |
Retail Commercial Truck Dealership | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 228.5 | 309.5 | 440.2 | 516.2 |
Segment income | 9.3 | 7.6 | 15.8 | 13.4 |
Other | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 114.2 | 108.5 | 227.2 | 214.5 |
Segment income | 1.6 | 2.3 | 2.5 | 1.6 |
Non-Automotive Investments | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Segment income | $ 25.2 | $ 10.5 | $ 37.7 | $ 14.6 |

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