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Derivatives and Fair Value Measurements - Textual (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
t
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2023
t
Dec. 31, 2022
USD ($)
t
Dec. 31, 2021
USD ($)
t
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2022
$ / $
Dec. 31, 2021
AUD ($)
Derivatives, Fair Value [Line Items]                      
Derivative, Collateral, Right to Reclaim Cash   $ 130,100,000 $ 9,500,000       $ 130,100,000 $ 9,500,000      
Revenues             3,318,300,000 2,881,100,000 $ 4,623,400,000    
Margin Deposit Assets   91,800,000 6,500,000       $ 91,800,000 6,500,000      
Unobservable Measurement Input, Uncertainty, Description             10        
Trading and Brokerage Coal Deliveries                      
Derivatives, Fair Value [Line Items]                      
Revenues               (28,500,000) (18,800,000)    
Coal Trading                      
Derivatives, Fair Value [Line Items]                      
Derivative, Collateral, Right to Reclaim Cash   38,300,000 3,000,000       $ 38,300,000 3,000,000      
Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Unrealized (loss) gain recognized in income on derivatives             (121,100,000) (27,400,000) 51,800,000    
Designated as Hedging Instrument | Net Amount                      
Derivatives, Fair Value [Line Items]                      
Derivative Liability, Collateral, Right to Reclaim Cash, Offset   91,800,000 6,500,000       91,800,000 6,500,000      
Foreign currency option contracts                      
Derivatives, Fair Value [Line Items]                      
Derivative, Notional Amount                     $ 535,000,000
Foreign currency option contracts | Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Unrealized (loss) gain recognized in income on derivatives             $ (7,500,000) 7,100,000 1,200,000    
Diesel Fuel Hedge Contracts                      
Derivatives, Fair Value [Line Items]                      
Derivative, Notional Amount                     $ 0
Financial trading contracts                      
Derivatives, Fair Value [Line Items]                      
Derivative, Nonmonetary Notional Amount, Mass | t             2,500,000        
Financial trading contracts | Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Unrealized (loss) gain recognized in income on derivatives             $ 1,500,000 (4,900,000) 8,400,000    
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Unrealized (loss) gain recognized in income on derivatives             $ (113,700,000) $ (34,500,000) $ 50,600,000    
Gain (Loss) on Derivative Instruments | Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Unrealized (loss) gain recognized in income on derivatives   86,000,000 28,000,000 $ 42,000,000              
Forward Contracts | Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Unrealized (loss) gain recognized in income on derivatives   $ 29,000,000 $ 1,000,000                
Scenario, Forecast                      
Derivatives, Fair Value [Line Items]                      
Price per ton           $ 84          
Scenario, Forecast | Foreign currency option contracts | Minimum                      
Derivatives, Fair Value [Line Items]                      
Derivative, Exchange Rate Cap | $ / $                   0.76  
Scenario, Forecast | Foreign currency option contracts | Maximum                      
Derivatives, Fair Value [Line Items]                      
Derivative, Exchange Rate Cap | $ / $                   0.80  
Scenario, Forecast | Financial trading contracts                      
Derivatives, Fair Value [Line Items]                      
Derivative, Nonmonetary Notional Amount, Mass | t 400,000         2,100,000          
Scenario, Forecast | Coal Contract to settle in 2022                      
Derivatives, Fair Value [Line Items]                      
Derivative, Nonmonetary Notional Amount, Mass | t           1,400,000          
Scenario, Forecast | Coal Contract to settle in 2023                      
Derivatives, Fair Value [Line Items]                      
Derivative, Nonmonetary Notional Amount, Mass | t         700,000