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Segment Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information |  |  |  |  |
Number of reportable segments | item |  |  | 4 |  |
Number of operating segments | item |  |  | 6 |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | $ 5,658.6 | $ 5,524.4 | $ 17,345.8 | $ 15,988.9 |
Adjusted segment income | 157.1 | 138.9 | 477.6 | 420.5 |
Retail Automotive Dealership |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 5,148.5 | 5,085.4 | 15,900.0 | 14,882.5 | $ 19,800.0
Retail Automotive Dealership | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 5,148.5 | 5,085.4 | 15,900.0 | 14,882.5 |
Adjusted segment income | 94.6 | 94.3 | 318.2 | 319.9 |
Retail Commercial Truck Dealership |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 385.3 | 299.6 | 1,016.5 | 739.8 |
Retail Commercial Truck Dealership | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 385.3 | 299.6 | 1,016.5 | 739.8 |
Adjusted segment income | 19.1 | 11.7 | 47.2 | 27.5 |
Commercial Vehicle Distribution and Other |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 124.8 | 139.4 | 429.3 | 366.6 |
Other | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Revenues | 124.8 | 139.4 | 429.3 | 366.6 |
Adjusted segment income | 2.6 | 2.4 | 20.4 | 4.9 |
Non-Automotive Investments | Operating segments |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |
Adjusted segment income | $ 40.8 | $ 30.5 | $ 91.8 | $ 68.2 |

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: 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(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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