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Segment Information - Reporting information by segment (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  |  |  |  |  | 4 |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 5,439.3 | $ 5,658.6 | $ 5,940.3 | $ 5,746.9 | $ 5,398.0 | $ 5,524.4 | $ 5,383.4 | $ 5,081.1 | $ 22,785.1 | $ 21,386.9 | $ 20,118.5
Floor plan interest expense |  |  |  |  |  |  |  |  | 80.9 | 63.4 | 50.9
Other interest expense |  |  |  |  |  |  |  |  | 114.7 | 107.4 | 85.4
Depreciation |  |  |  |  |  |  |  |  | 103.7 | 95.1 | 89.7
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 134.8 | 107.6 | 69.5
Adjusted segment income |  |  |  |  |  |  |  |  | 604.1 | 548.2 | 508.1
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |  |  |  |  |  |  |  |  |
Total assets | 10,904.5 |  |  |  | 10,540.6 |  |  |  | 10,904.5 | 10,540.6 |
Equity method investments | 1,305.2 |  |  |  | 1,256.6 |  |  |  | 1,305.2 | 1,256.6 |
Capital expenditures |  |  |  |  |  |  |  |  | $ 305.6 | 247.0 | 203.1
Intersegment Elimination |  |  |  |  |  |  |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | (3.9)
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  |  |  |  |  | 1 |  |
Number of operating segments | item |  |  |  |  |  |  |  |  | 6 |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 20,849.2 | 19,824.3 | 18,673.2
Retail Automotive Dealership | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 20,849.2 | 19,824.3 | 18,673.2
Floor plan interest expense |  |  |  |  |  |  |  |  | 74.9 | 59.4 | 47.1
Other interest expense |  |  |  |  |  |  |  |  | 108.3 | 95.0 | 74.8
Depreciation |  |  |  |  |  |  |  |  | 94.2 | 85.7 | 81.7
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 5.2 | 4.6 | 4.9
Adjusted segment income |  |  |  |  |  |  |  |  | 389.7 | 397.2 | 412.9
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |  |  |  |  |  |  |  |  |
Total assets | 8,501.4 |  |  |  | 8,157.0 |  |  |  | 8,501.4 | 8,157.0 |
Equity method investments | 64.1 |  |  |  | 68.5 |  |  |  | 64.1 | 68.5 |
Capital expenditures |  |  |  |  |  |  |  |  | 292.6 | 237.8 | 195.6
Retail Commercial Truck Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,374.5 | 1,048.0 | 1,000.7
Retail Commercial Truck Dealership | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,374.5 | 1,048.0 | 1,000.7
Floor plan interest expense |  |  |  |  |  |  |  |  | 4.2 | 2.7 | 2.9
Other interest expense |  |  |  |  |  |  |  |  | 2.4 | 3.4 | 4.1
Depreciation |  |  |  |  |  |  |  |  | 4.3 | 4.1 | 3.2
Adjusted segment income |  |  |  |  |  |  |  |  | 62.3 | 38.4 | 26.2
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |  |  |  |  |  |  |  |  |
Total assets | 571.5 |  |  |  | 553.4 |  |  |  | 571.5 | 553.4 |
Capital expenditures |  |  |  |  |  |  |  |  | 9.3 | 6.4 | 3.3
Other | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 561.4 | 514.6 | 448.5
Floor plan interest expense |  |  |  |  |  |  |  |  | 1.8 | 1.3 | 0.9
Other interest expense |  |  |  |  |  |  |  |  | 4.0 | 9.0 | 6.5
Depreciation |  |  |  |  |  |  |  |  | 5.2 | 5.3 | 4.8
Adjusted segment income |  |  |  |  |  |  |  |  | 22.5 | 9.6 | 4.4
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |  |  |  |  |  |  |  |  |
Total assets | 590.5 |  |  |  | 642.1 |  |  |  | 590.5 | 642.1 |
Capital expenditures |  |  |  |  |  |  |  |  | 3.7 | 2.8 | 4.2
Non-Automotive Investments | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenues and segment income by reportable segment |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 129.6 | 103.0 | 64.6
Adjusted segment income |  |  |  |  |  |  |  |  | 129.6 | 103.0 | $ 64.6
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,241.1 |  |  |  | 1,188.1 |  |  |  | 1,241.1 | 1,188.1 |
Equity method investments | $ 1,241.1 |  |  |  | $ 1,188.1 |  |  |  | $ 1,241.1 | $ 1,188.1 |

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