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Segment Information - Total Assets, Equity Method Investments, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information |  |  |  |
Capital expenditures | $ 79.1 | $ 80.9 | $ 226.5 | $ 282.6
Retail Automotive |  |  |  |
Segment Reporting Information |  |  |  |
Capital expenditures | 63.1 | 68.2 | 172.6 | 243.1
Retail Commercial Truck |  |  |  |
Segment Reporting Information |  |  |  |
Capital expenditures | 14.0 | 10.7 | 49.3 | 33.3
Other |  |  |  |
Segment Reporting Information |  |  |  |
Capital expenditures | 2.0 | 2.0 | 4.6 | 6.2
Non-Automotive Investments |  |  |  |
Segment Reporting Information |  |  |  |
Capital expenditures | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480060/805-50-25-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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