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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Revenue from External Customer [Line Items] |  |  |  |  |
Customer rebates and allowances | $ 88.7 |  | $ 88.7 |  | $ 91.4
Building Materials Distribution | Shipping and Handling |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Cost of goods and services sold | $ 72.3 | $ 67.7 | $ 201.5 | $ 191.2 |

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