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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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