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Segment Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($) | 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 | $ 5,524.4 | $ 5,152.0 | $ 15,988.9 | $ 15,230.7 |
Segment income | 138.9 | 130.1 | 420.5 | 393.2 |
Intersegment Elimination |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues |  | (0.9) |  | (2.6) |
Retail Automotive Dealership |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 5,085.4 | 4,772.1 | 14,882.5 | 14,121.8 | $ 18,700.0
Retail Automotive Dealership | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 5,085.4 | 4,772.1 | 14,882.5 | 14,121.8 |
Segment income | 94.3 | 97.2 | 319.9 | 330.7 |
Retail Commercial Truck Dealership |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 299.6 | 266.1 | 739.8 | 782.3 |
Retail Commercial Truck Dealership | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 299.6 | 266.1 | 739.8 | 782.3 |
Segment income | 11.7 | 8.4 | 27.5 | 21.8 |
Other | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 139.4 | 114.7 | 366.6 | 329.2 |
Segment income | 2.4 | 0.1 | 4.9 | 1.7 |
Non-Automotive Investments | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Segment income | $ 30.5 | $ 24.4 | $ 68.2 | $ 39.0 |

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