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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
 [2]
Sep. 30, 2025
Sep. 30, 2024
 [2]
Statement of Comprehensive Income [Abstract]        
Net income $ 39.5 $ 8.8 [1] $ 84.3 [3] $ 45.9 [1],[3]
Other comprehensive income (loss), net of tax - Note 8:        
Defined benefit plans 0.2 0.5 0.7 (0.1)
Cash flow hedges (0.7) 1.6 5.5 3.3
Other comprehensive (loss) income, net of tax (0.5) 2.1 6.2 3.2
Comprehensive income $ 39.0 $ 10.9 $ 90.5 $ 49.1
[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] See Note 12 for supplemental cash flow information.