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Change in Accounting Principle - Schedule of Consolidated Income (Loss) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
 [4]
Jun. 30, 2025
Jun. 30, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cost of products sold, excluding depreciation and amortization $ 722.8   $ 669.8 [1]   $ 1,396.2 $ 1,321.1 [1]
Operating income 38.0   36.2 [1]   79.4 60.5 [1]
Income tax provision (6.7)   (5.7) [1],[2]   (13.9) (11.2) [1],[2]
Net Income (Loss) $ 23.2 $ 21.6 $ 18.9 [1],[3] $ 18.2 $ 44.8 [5] $ 37.1 [1],[3],[5]
Earnings Per Share, Basic [Abstract]            
Basic $ 1.44   $ 1.18 [1],[6]   $ 2.77 [6] $ 2.31 [1],[6]
Diluted $ 1.41   $ 1.15 [1],[6]   $ 2.72 [6] $ 2.27 [1],[6]
Previously Reported            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cost of products sold, excluding depreciation and amortization     $ 690.5     $ 1,333.4
Operating income     15.5     48.2
Income tax provision     (0.8)     (8.3)
Net Income (Loss)     $ 3.1     $ 27.7
Earnings Per Share, Basic [Abstract]            
Basic     $ 0.19     $ 1.72
Diluted     $ 0.19     $ 1.69
As Computed using LIFO            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cost of products sold, excluding depreciation and amortization $ 745.5       $ 1,452.1  
Operating income 15.3       23.5  
Income tax provision (2.2)       (1.5)  
Net Income (Loss) $ 5.0       $ 1.3  
Earnings Per Share, Basic [Abstract]            
Basic $ 0.31       $ 0.08  
Diluted $ 0.3       $ 0.08  
Effect of Change            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cost of products sold, excluding depreciation and amortization $ (22.7)   $ (20.7)   $ (55.9) $ (12.3)
Operating income 22.7   20.7   55.9 12.3
Income tax provision (4.5)   (4.9)   (12.4) (2.9)
Net Income (Loss) $ 18.2   $ 15.8   $ 43.5 $ 9.4
Earnings Per Share, Basic [Abstract]            
Basic $ 1.13   $ 0.99   $ 2.69 $ 0.59
Diluted $ 1.11   $ 0.96   $ 2.64 $ 0.58
[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.