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Segment Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) item | Mar. 31, 2016 USD ($) | 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 | $ 5,081.1 | $ 4,824.6 |
Segment income | 124.7 | 119.6 |
Intersegment Elimination |  |  |
Revenues and segment income by reportable segment |  |  |
Revenues |  | (1.0) |
Retail Automotive Dealership |  |  |
Revenues and segment income by reportable segment |  |  |
Revenues | 4,756.4 | 4,512.9 | $ 18,700.0
Retail Automotive Dealership | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Revenues | 4,756.4 | 4,512.9 |
Segment income | 104.8 | 110.4 |
Retail Commercial Truck Dealership |  |  |
Revenues and segment income by reportable segment |  |  |
Revenues | 211.7 | 206.7 |
Retail Commercial Truck Dealership | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Revenues | 211.7 | 206.7 |
Segment income | 6.5 | 5.8 |
Other | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Revenues | 113.0 | 106.0 |
Segment income | 0.9 | (0.7) |
Non-Automotive Investments | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Segment income | $ 12.5 | $ 4.1 |

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