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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer rebates and allowances | $ 79.0 |  | $ 79.0 |  | $ 83.5
Building Materials Distribution | Shipping and Handling |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Cost of goods and services sold | $ 76.7 | $ 68.9 | $ 141.4 | $ 129.2 |

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