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Leases - Textuals (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
leases
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]      
Lease Obligation, Assumed Amount Recoverable from Third Parties $ 0.0    
Provision for North Goonyella equipment loss $ 0.0 $ 24.7 $ 66.4
Number of Operating Leases with Contingent Rent Provisions | leases 1    
Operating Leases, Rent Expense, Contingent Rentals $ 0.0    
Minimum      
Lessee, Lease, Description [Line Items]      
Operating and Finance Leases Remaining Lease Term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Operating and Finance Leases Remaining Lease Term 21 years 9 months 18 days