v3.26.1
Segment Information - Capital Expenditures (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]    
Capital expenditures incurred but not yet paid $ 89.8 $ 103.2
Operating Segments | Siding & Trim    
Segment Reporting [Line Items]    
Capital expenditures incurred but not yet paid 49.2 73.9
Operating Segments | Deck, Rail & Accessories    
Segment Reporting [Line Items]    
Capital expenditures incurred but not yet paid 12.9 0.0
Operating Segments | Australia & New Zealand    
Segment Reporting [Line Items]    
Capital expenditures incurred but not yet paid 14.3 13.7
Operating Segments | Europe    
Segment Reporting [Line Items]    
Capital expenditures incurred but not yet paid 10.3 12.9
General Corporate and R&D    
Segment Reporting [Line Items]    
Capital expenditures incurred but not yet paid $ 3.1 $ 2.7