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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
(Tax) benefit on benefit plan liability adjustments - net gain (loss) $ 0.0 $ (1.5) $ (0.7)
(Tax) benefit on benefit plan liability adjustments - prior service costs 0.0 0.0 0.0
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss 0.0 (0.2) (0.7)
Interest Rate Swap      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification,Tax (Benefit) (0.7) (0.7) (0.7)
Commodity Contract      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification,Tax (Benefit) (0.7) 0.7 0.5
(Tax) benefit on net unrealized gains (losses) on commodity derivatives $ 1.1 $ 0.2 $ (1.0)