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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net income $ 26.4 $ 48.8 $ 182.6 $ 192.7
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 $(0.1), respectively) 0.0 0.0 0.1 0.1
Net unrealized gains (losses) on commodity derivatives (net of tax of $0.0, $0.1, $0.0, and $0.3, respectively) 0.1 (0.2) (0.1) (0.9)
Other comprehensive income, net of tax 0.7 0.4 4.2 2.7
Comprehensive income 27.1 49.2 186.8 195.4
Less: comprehensive income attributable to non-controlling interest (2.0) (3.4) (7.6) (10.2)
Comprehensive income available for common stock 25.1 45.8 179.2 185.2
Interest rate swaps        
Other comprehensive income (loss), net of tax:        
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax 0.6 0.6 1.7 1.6
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 $ 2.5 $ 1.9