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Change in Accounting Principle - Schedule of Consolidated Income (Loss) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
 [4]
Mar. 31, 2024
 [4]
Sep. 30, 2025
Sep. 30, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cost of products sold, excluding depreciation and amortization $ 728.8     $ 676.0 [1]     $ 2,125.0 $ 1,997.1 [1]
Operating (loss) income 48.8     13.2 [1]     128.2 73.7 [1]
Income tax benefit (provision) (8.3)     (2.4) [1],[2]     (22.2) (13.6) [1],[2]
Net Income (Loss) $ 39.5 $ 23.2 $ 21.6 $ 8.8 [1],[3] $ 18.9 $ 18.2 $ 84.3 [5] $ 45.9 [1],[3],[5]
Net (loss) income per common share:                
Basic $ 2.44     $ 0.54 [1],[6]     $ 5.22 [6] $ 2.85 [1],[6]
Diluted $ 2.38     $ 0.54 [1],[6]     $ 5.1 [6] $ 2.81 [1],[6]
Previously Reported                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cost of products sold, excluding depreciation and amortization       $ 671.8       $ 2,005.2
Operating (loss) income       17.4       65.6
Income tax benefit (provision)       (3.4)       (11.7)
Net Income (Loss)       $ 12.0       $ 39.7
Net (loss) income per common share:                
Basic       $ 0.75       $ 2.47
Diluted       $ 0.74       $ 2.44
As Computed using LIFO                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cost of products sold, excluding depreciation and amortization $ 790.2           $ 2,242.3  
Operating (loss) income (12.6)           10.9  
Income tax benefit (provision) 1.4           (0.1)  
Net Income (Loss) $ (12.2)           $ (10.9)  
Net (loss) income per common share:                
Basic $ (0.75)           $ (0.68)  
Diluted $ (0.75)           $ (0.68)  
Effect of Change                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cost of products sold, excluding depreciation and amortization $ (61.4)     $ 4.2     $ (117.3) $ (8.1)
Operating (loss) income 61.4     (4.2)     117.3 8.1
Income tax benefit (provision) (9.7)     1.0     (22.1) (1.9)
Net Income (Loss) $ 51.7     $ (3.2)     $ 95.2 $ 6.2
Net (loss) income per common share:                
Basic $ 3.19     $ (0.21)     $ 5.9 $ 0.38
Diluted $ 3.13     $ (0.2)     $ 5.78 $ 0.37
[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[2] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[3] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[4] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[5] See Note 12 for supplemental cash flow information.
[6] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.