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Change in Accounting Principle - Schedule of Consolidated Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
 [3]
Jun. 30, 2025
Jun. 30, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net Income (Loss) $ 23.2 $ 21.6 $ 18.9 [1],[2] $ 18.2 $ 44.8 [4] $ 37.1 [1],[2],[4]
Deferred income taxes [4]         11.2 9.3 [5]
LIFO valuation inventory expense           0.0
Inventories [4]         6.3 14.8 [5]
Accrued liabilities [4]         (26.0) (3.4) [5]
Net cash provided by operating activities [4]         72.9 89.6 [5]
Previously Reported            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net Income (Loss)     3.1     27.7
Deferred income taxes           6.4
LIFO valuation inventory expense           4.5
Inventories           22.6
Net cash provided by operating activities           89.6
As Computed using LIFO            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net Income (Loss) 5.0       1.3  
Deferred income taxes         (0.1)  
Inventories         62.2  
Accrued liabilities         (27.1)  
Net cash provided by operating activities         72.9  
Effect of Change            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net Income (Loss) $ 18.2   $ 15.8   43.5 9.4
Deferred income taxes         11.3 2.9
LIFO valuation inventory expense           (4.5)
Inventories         (55.9) $ (7.8)
Accrued liabilities         $ 1.1  
[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.