v3.26.3
Segment Information - Restructuring, Strategic Investment & Proxy Contest Charges (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
segment
Sep. 30, 2025
USD ($)
Segment Reporting [Line Items]        
Number of reporting segments | segment     3  
Restructuring and other (income) charges, net $ 0.2 $ 1.0 $ 2.4 $ 10.1
Indirect costs allocated to Divestiture 0.0 3.5 0.0 9.7
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold        
Segment Reporting [Line Items]        
Indirect costs allocated to Divestiture 0.0 1.4 0.0 5.1
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet        
Segment Reporting [Line Items]        
Indirect costs allocated to Divestiture 0.0 0.1 0.0 0.1
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense        
Segment Reporting [Line Items]        
Indirect costs allocated to Divestiture 0.0 2.0 0.0 4.5
Indirect costs allocated to Divestiture        
Segment Reporting [Line Items]        
Restructuring and other (income) charges, net 0.0 0.7 0.0 2.1
Performance Materials | Operating Segments        
Segment Reporting [Line Items]        
Restructuring and other (income) charges, net 0.0 0.0 1.5 0.0
Pavement Technologies | Operating Segments        
Segment Reporting [Line Items]        
Restructuring and other (income) charges, net 0.0 0.2 1.8 1.4
Advanced Polymer Technologies segment | Operating Segments        
Segment Reporting [Line Items]        
Restructuring and other (income) charges, net $ 0.2 $ 0.1 $ (0.9) $ 6.6