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Change in Accounting Principle - Schedule of Consolidated Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
 [3]
Mar. 31, 2024
 [3]
Sep. 30, 2025
Sep. 30, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net Income (Loss) $ 39.5 $ 23.2 $ 21.6 $ 8.8 [1],[2] $ 18.9 $ 18.2 $ 84.3 [4] $ 45.9 [1],[2],[4]
Deferred income taxes [4]             21.2 10.4 [5]
LIFO valuation inventory expense               0.0
Inventories [4]             (100.4) (8.0) [5]
Accrued liabilities [4]             (28.3) (11.6) [5]
Net cash provided by operating activities [4]             132.0 123.7 [5]
Previously Reported                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net Income (Loss)       12.0       39.7
Deferred income taxes               8.5
LIFO valuation inventory expense               8.8
Inventories               (8.7)
Net cash provided by operating activities               123.7
As Computed using LIFO                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net Income (Loss) (12.2)           (10.9)  
Deferred income taxes             (0.9)  
Inventories             16.9  
Net cash provided by operating activities             132.0  
Effect of Change                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net Income (Loss) $ 51.7     $ (3.2)     95.2 6.2
Deferred income taxes             22.1 1.9
LIFO valuation inventory expense               (8.8)
Inventories             (117.3) $ 0.7
Net cash provided by operating activities             $ 0.0  
[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] See Note 12 for supplemental cash flow information.
[5] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.