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Segment Information - Reporting information by segment (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) segment reporting | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting Information |  |  |
Number of reportable segments | segment | 4 |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | $ 25,554.7 | $ 20,443.9 | $ 23,179.4
Floor plan interest expense | 26.2 | 46.3 | 84.5
Other interest expense | 68.6 | 111.0 | 124.2
Depreciation | 121.5 | 115.5 | 109.6
Equity in earnings of affiliates | 374.5 | 169.0 | 147.5
Adjusted segment income | 1,607.7 | 707.6 | 591.5
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |
Total assets | 13,464.6 | 13,247.2 |
Equity method investments | 1,688.1 | 1,500.3 |
Capital expenditures | 248.9 | 185.9 | 245.3
Intersegment Elimination |  |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | 0.0 | 0.0 | 0.0
Floor plan interest expense | 0.0 | 0.0 | 0.0
Other interest expense | 0.0 | 0.0 | 0.0
Depreciation | 0.0 | 0.0 | 0.0
Equity in earnings of affiliates | 0.0 | 0.0 | 0.0
Adjusted segment income | 0.0 | 0.0 | 0.0
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |
Total assets | 0.0 | 0.0 |
Equity method investments | 0.0 | 0.0 |
Capital expenditures | $ 0.0 | 0.0 | 0.0
Retail automotive dealership |  |  |
Segment Reporting Information |  |  |
Number of reportable segments | segment | 1 |  |
Number of operating segments | reporting | 6 |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | $ 22,513.3 | 17,928.8 | 20,615.8
Retail automotive dealership | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | 22,513.3 | 17,928.8 | 20,615.8
Floor plan interest expense | 23.9 | 39.6 | 74.9
Other interest expense | 63.8 | 105.9 | 118.4
Depreciation | 108.7 | 103.8 | 99.1
Equity in earnings of affiliates | 8.2 | 4.4 | 5.2
Adjusted segment income | 1,046.6 | 443.4 | 339.9
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |
Total assets | 9,940.4 | 10,352.8 |
Equity method investments | 40.7 | 77.2 |
Capital expenditures | 239.4 | 175.6 | 231.9
Retail commercial truck dealership |  |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | 2,465.7 | 2,060.9 | 2,050.5
Retail commercial truck dealership | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | 2,465.7 | 2,060.9 | 2,050.5
Floor plan interest expense | 1.9 | 5.6 | 8.0
Other interest expense | 3.3 | 3.7 | 3.2
Depreciation | 7.9 | 6.4 | 5.5
Equity in earnings of affiliates | 0.0 | 0.0 | 0.0
Adjusted segment income | 160.3 | 78.2 | 86.5
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |
Total assets | 1,269.4 | 839.1 |
Equity method investments | 0.0 | 0.0 |
Capital expenditures | 6.3 | 7.2 | 9.9
Other | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | 575.7 | 454.2 | 513.1
Floor plan interest expense | 0.4 | 1.1 | 1.6
Other interest expense | 1.5 | 1.4 | 2.6
Depreciation | 4.9 | 5.3 | 5.0
Equity in earnings of affiliates | 0.0 | 0.0 | 0.0
Adjusted segment income | 34.5 | 21.4 | 22.8
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |
Total assets | 607.4 | 632.2 |
Equity method investments | 0.0 | 0.0 |
Capital expenditures | 3.2 | 3.1 | 3.5
Non-Automotive Investments | Operating segments |  |  |
Revenues and segment income by reportable segment |  |  |
Total revenues | 0.0 | 0.0 | 0.0
Floor plan interest expense | 0.0 | 0.0 | 0.0
Other interest expense | 0.0 | 0.0 | 0.0
Depreciation | 0.0 | 0.0 | 0.0
Equity in earnings of affiliates | 366.3 | 164.6 | 142.3
Adjusted segment income | 366.3 | 164.6 | 142.3
Total assets, equity method investments, and capital expenditures by reporting segment |  |  |
Total assets | 1,647.4 | 1,423.1 |
Equity method investments | 1,647.4 | 1,423.1 |
Capital expenditures | $ 0.0 | $ 0.0 | $ 0.0

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