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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ 0.8 $ 10.0 $ (5.7) $ 73.0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (1.6) (19.3) (2.4) (55.5)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 2.4 29.3 (3.3) 128.5
Foreign Exchange Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 0.8 (0.1) (5.7) (5.2)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (1.6) (2.9) (2.4) (5.8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 2.4 2.8 (3.3) 0.6
Physical commodity purchase / sale contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net   10.0   78.1
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0.0 (30.3) 0.0 (80.9)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax   40.3   159.0
Coal Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ 0.0 0.1 $ 0.0 0.1
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net   13.9   31.2
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax   $ (13.8)   $ (31.1)