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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 31.0 $ 39.5 $ 190.3 [1] $ 84.3 [1]
Other comprehensive income (loss), net of tax - Note 7:        
Defined benefit plans 0.3 0.2 0.7 0.7
Cash flow hedges 9.5 (0.7) (8.0) 5.5
Other comprehensive income (loss), net of tax 9.8 (0.5) (7.3) 6.2
Comprehensive income $ 40.8 $ 39.0 $ 183.0 $ 90.5
[1] See Note 11 for supplemental cash flow information.