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Restructuring - Summary of Activity Relating to Restructuring Plan Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 18 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
 [1]
Sep. 30, 2025
Sep. 30, 2024
 [1]
Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]              
Restructuring costs $ 0.0     $ 0.7 $ 1.9 $ 7.6  
2025 Plan              
Restructuring Cost and Reserve [Line Items]              
Beginning balance 0.2 $ 0.5 $ 0.0   0.0    
Restructuring costs 0.0 0.1 1.8        
Costs paid or otherwise settled (0.1) (0.4) (1.3)        
Ending balance 0.1 0.2 0.5   0.1   $ 0.1
2024 Plan              
Restructuring Cost and Reserve [Line Items]              
Beginning balance 4.6 4.6 4.7   4.7    
Restructuring costs 0.0 0.0 0.0       7.5
Costs paid or otherwise settled 0.0 0.0 (0.1)        
Ending balance $ 4.6 $ 4.6 $ 4.6   $ 4.6   $ 4.6
[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.