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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net income $ 283.7 $ 276.0 $ 270.8
Other comprehensive income (loss), net of tax:      
Benefit plan liability adjustments - net gain (loss) (net of tax of $(0.2), $0, and $(1.5), respectively) 0.8 (0.3) 4.6
Reclassification adjustment of benefit plan liability - net loss (net of tax of $(0.1), $0, and $(0.2), respectively) 0.1 0.2 0.5
Reclassification adjustment of benefit plan liability - prior service cost (net of tax of $0, $0, and $0, respectively)     (0.1)
Net unrealized gains (losses) on commodity derivatives (net of tax of $0.1, $1.1, and $0.2, respectively) (0.5) (3.6) (0.6)
Other comprehensive income (loss), net of tax 5.4 0.8 4.5
Comprehensive income 289.1 276.8 275.3
Less: comprehensive income attributable to non-controlling interest (10.6) (13.8) (12.4)
Comprehensive income available for common stock 278.5 263.0 262.9
Interest rate swaps      
Other comprehensive income (loss), net of tax:      
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax 2.3 2.2 2.1
Commodity derivatives      
Other comprehensive income (loss), net of tax:      
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax $ 2.7 $ 2.3 $ (2.0)