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Other Events (Details)
T in Millions, $ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
T
Mar. 31, 2019
USD ($)
Mar. 31, 2018
AUD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 06, 2018
Other Commercial Events [Line Items]                  
Costs Related to North Goonyella Events               $ 58.0  
Insurance Recoveries     $ 125.0   $ 0.0        
Provision for North Goonyella equipment loss     24.7   0.0     $ 66.4  
Containment and idling costs     36.9            
Deductible Amount     50.0            
Insurance Recoveries, Cash Collected     8.1            
Proceeds from Sale of Property, Plant, and Equipment     11.0   23.0        
Net gain on disposals     $ 1.5   30.6        
Interest in unincorporated joint venture project     50.00%     50.00%      
Stanmore Coal Limited                  
Other Commercial Events [Line Items]                  
Coal Reserves, in tons | T   23.0              
Proceeds from Sale of Property, Plant, and Equipment   $ 22.0 $ 7.0            
Accounts Receivable, Net     7.0     $ 7.0      
Other                  
Other Commercial Events [Line Items]                  
Provision for North Goonyella equipment loss     17.2            
Leased Equipment                  
Other Commercial Events [Line Items]                  
Provision for North Goonyella equipment loss           $ 50.7      
Owned Equipment                  
Other Commercial Events [Line Items]                  
Provision for North Goonyella equipment loss     $ 23.2            
DTA and PBGC                  
Other Commercial Events [Line Items]                  
Equity Method Investment, Ownership Percentage                 50.00%
Red Mountain Joint Venture                  
Other Commercial Events [Line Items]                  
Proceeds from Sale of Property, Plant, and Equipment         20.0        
Net gain on disposals         7.1        
Queensland’s Bowen Basin                  
Other Commercial Events [Line Items]                  
Proceeds from Sale of Property, Plant, and Equipment       $ 37.0          
Net gain on disposals         $ 20.6        
Scenario, Forecast                  
Other Commercial Events [Line Items]                  
Costs Related to North Goonyella Events             $ 275.0    
Scenario, Forecast | Leased Equipment                  
Other Commercial Events [Line Items]                  
Costs Related to North Goonyella Events             $ 10.0    
Subsequent Event | Yancoal Technology Development Pty Ltd                  
Other Commercial Events [Line Items]                  
Payments to exercise option to acquire equipment $ 54.2