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Leases (Narrative) (Details) - Drilling Rigs [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Jan. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description [Line Items]      
Estimated Lease Payments   $ 11.9 $ 8.4
Deferred Charges [Member]      
Lessee, Lease, Description [Line Items]      
Operating Lease Asset $ 16.4    
Other Accruals and Current Liabilities [Member]      
Lessee, Lease, Description [Line Items]      
Operating Lease Liability - Current 14.2    
Other Liabilities [Member]      
Lessee, Lease, Description [Line Items]      
Operating Lease Liability - Noncurrent $ 2.2    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lease Term 1 year