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Derivatives and Fair Value Measurements - Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ 3.6 $ (2.8) $ (2.1) $ 70.3
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (0.1) (21.9) (2.5) (77.3)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 3.7 19.1 0.4 147.6
Foreign Exchange Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 3.6 (2.7) (2.1) (7.8)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (0.1) (2.2) (2.5) (7.9)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 3.7 (0.5) 0.4 0.1
Physical commodity purchase / sale contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net       78.1
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0.0 0.0 0.0 (80.9)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax       159.0
Coal Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ 0.0 (0.1) $ 0.0 0.0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net   (19.7)   11.5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax   $ 19.6   $ (11.5)