Net Sales - Summary of Net Sales by Product Line and Geography (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Net sales	$ 2,674.6	$ 2,503.7	$ 4,587.0	$ 4,236.0
Residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	1,328.9	1,298.0	2,256.3	2,148.1
Non-residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	745.1	670.8	1,273.7	1,120.8
Complementary building products
Disaggregation Of Revenue [Line Items]
Net sales	600.6	534.9	1,057.0	967.1
U.S.
Disaggregation Of Revenue [Line Items]
Net sales	2,589.5	2,423.5	4,456.3	4,124.4
U.S. | Residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	1,306.5	1,276.1	2,227.1	2,120.1
U.S. | Non-residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	686.9	615.7	1,179.0	1,041.8
U.S. | Complementary building products
Disaggregation Of Revenue [Line Items]
Net sales	596.1	531.7	1,050.2	962.5
Canada
Disaggregation Of Revenue [Line Items]
Net sales	85.1	80.2	130.7	111.6
Canada | Residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	22.4	21.9	29.2	28.0
Canada | Non-residential roofing products
Disaggregation Of Revenue [Line Items]
Net sales	58.2	55.1	94.7	79.0
Canada | Complementary building products
Disaggregation Of Revenue [Line Items]
Net sales	$ 4.5	$ 3.2	$ 6.8	$ 4.6