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Leases (Narrative) (Details) - Drilling Rigs [Member] - USD ($)
$ in Millions
Jan. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description [Line Items]    
Estimated Lease Payments   $ 8.4
Deferred Charges [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease Asset   8.1
Other Accruals and Current Liabilities [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease Liability - Current   7.2
Other Liabilities [Member]    
Lessee, Lease, Description [Line Items]    
Operating Lease Liability - Noncurrent   $ 0.9
Subsequent Event [Member]    
Lessee, Lease, Description [Line Items]    
Estimated Lease Payments $ 11.9  
Minimum [Member]    
Lessee, Lease, Description [Line Items]    
Lease Term   1 year