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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income $ 25.9 $ 26.4 $ 191.1 $ 182.6
Other comprehensive income (loss), net of tax:        
Reclassification adjustments of benefit plan liability - net loss (net of tax of $0.0, $0.0, $0.0 and $0.0, respectively) 0.0 0.0 0.1 0.1
Net unrealized gains (losses) on commodity derivatives (net of tax of $0.4, $0.0, $0.4, and $0.0, respectively) (1.3) 0.1 (1.5) (0.1)
Other comprehensive income (loss), net of tax (0.8) 0.7 0.6 4.2
Comprehensive income 25.1 27.1 191.7 186.8
Less: comprehensive income attributable to non-controlling interest (1.0) (2.0) (4.5) (7.6)
Comprehensive income available for common stock 24.1 25.1 187.2 179.2
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax 0.5 0.6 1.6 1.7
Commodity derivatives        
Other comprehensive income (loss), net of tax:        
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax $ 0.0 $ 0.0 $ 0.4 $ 2.5