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Segment and Geographic Information Reconciliation of Assets by Segment to Consolidated Total Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Predecessor      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets   $ 11,777.7 $ 10,946.9
Property, Plant and Equipment, Net   8,776.7 9,258.5
Predecessor | U.S. Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets   4,255.9 4,105.8
Property, Plant and Equipment, Net   3,970.6 3,854.5
Predecessor | Australian Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets   5,402.2 5,319.9
Property, Plant and Equipment, Net   3,905.8 4,469.6
Predecessor | Trading and Brokerage      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets   128.7 217.2
Property, Plant and Equipment, Net   0.2 0.5
Predecessor | Corporate and Other      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets   1,990.9 1,304.0
Property, Plant and Equipment, Net   $ 900.1 $ 933.9
Successor      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets $ 8,181.2    
Property, Plant and Equipment, Net 5,111.9    
Successor | U.S. Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 3,848.6    
Property, Plant and Equipment, Net 3,361.0    
Successor | Australian Mining      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 2,656.3    
Property, Plant and Equipment, Net 1,501.7    
Successor | Trading and Brokerage      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 99.1    
Property, Plant and Equipment, Net 0.5    
Successor | Corporate and Other      
Segment Reporting, Asset Reconciling Item [Line Items]      
Total assets 1,577.2    
Property, Plant and Equipment, Net $ 248.7