Net Sales - Summary of Net Sales by Product Line and Geography (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Net sales	$ 9,763.2	$ 9,119.8	$ 8,429.7
Residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	4,833.5	4,652.0	4,217.9
Non-residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	2,674.1	2,395.7	2,464.3
Complementary building products
Disaggregation Of Revenue [Line Items]
Net sales	2,255.6	2,072.1	1,747.5
U.S.
Disaggregation Of Revenue [Line Items]
Net sales	9,466.5	8,842.9	8,160.4
U.S. | Residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	4,759.5	4,588.1	4,138.1
U.S. | Non-residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	2,474.2	2,192.6	2,285.7
U.S. | Complementary building products
Disaggregation Of Revenue [Line Items]
Net sales	2,232.8	2,062.2	1,736.6
Canada
Disaggregation Of Revenue [Line Items]
Net sales	296.7	276.9	269.3
Canada | Residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	74.0	63.9	79.8
Canada | Non-residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	199.9	203.1	178.6
Canada | Complementary building products
Disaggregation Of Revenue [Line Items]
Net sales	$ 22.8	$ 9.9	$ 10.9