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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net income $ 131.6 $ 117.4
Other comprehensive income (loss), net of tax:    
Net unrealized gains (losses) on commodity derivatives (net of tax of $0.0 and $0.3, respectively) (0.1) (0.9)
Other comprehensive income, net of tax 2.5 1.2
Comprehensive income 134.1 118.6
Less: comprehensive income attributable to non-controlling interest (3.7) (3.3)
Comprehensive income available for common stock 130.4 115.3
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
Commodity derivatives    
Other comprehensive income (loss), net of tax:    
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax $ 2.0 $ 1.5