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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
 [2]
Jun. 30, 2025
Jun. 30, 2024
 [2]
Statement of Comprehensive Income [Abstract]        
Net income $ 23.2 $ 18.9 [1] $ 44.8 [3] $ 37.1 [1],[3]
Other comprehensive income (loss), net of tax - Note 8:        
Defined benefit plans 0.4 (0.1) 0.5 (0.6)
Cash flow hedges 3.7 3.3 6.2 1.7
Other comprehensive income (loss), net of tax 4.1 3.2 6.7 1.1
Comprehensive income $ 27.3 $ 22.1 $ 51.5 $ 38.2
[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.