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Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) item | Mar. 31, 2015 USD ($)
Segment Reporting Information |  |
Number of reportable Segments | item | 3 |
Number of geographic operating segments | item | 4 |
Revenues and segment income by reportable segment |  |
Revenues | $ 4,824.6 | $ 4,482.9
Segment income | 119.6 | 115.6
Intersegment Elimination |  |
Revenues and segment income by reportable segment |  |
Revenues | (1.0) | (0.3)
Retail Automotive |  |
Revenues and segment income by reportable segment |  |
Revenues | 4,512.9 | 4,186.8
Segment income | 110.4 | 102.8
Retail Commercial Truck Dealership |  |
Revenues and segment income by reportable segment |  |
Revenues | 206.7 | 192.7
Segment income | 5.8 | 7.4
Other |  |
Revenues and segment income by reportable segment |  |
Revenues | 106.0 | 103.7
Segment income | $ 3.4 | $ 5.4

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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