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Long-Term Debt (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
May 31, 2018
Long-term Debt, Current Maturities [Abstract]      
Long-term debt $ 1,915,900,000 $ 1,906,200,000  
Principal outstanding 1,862,500,000 1,857,500,000  
Back end fees due to PPL and Keppel on Delivery of rigs 42,800,000 42,800,000  
Effective interest rate adjustments on PPL and Keppel delivery Financing 17,100,000 13,400,000  
Deferred finance charges (6,500,000) (7,500,000)  
Hayfin Loan Facility      
Long-term Debt, Current Maturities [Abstract]      
Long-term debt 197,000,000.0 195,000,000.0  
Principal 195,000,000    
Back end fees due to PPL and Keppel on Delivery of rigs 2,000,000    
Syndicated Senior Secured Credit Facilities      
Long-term Debt, Current Maturities [Abstract]      
Long-term debt 272,700,000 270,000,000.0  
Back end fees due to PPL and Keppel on Delivery of rigs 2,700,000    
New Bridge Facility      
Long-term Debt, Current Maturities [Abstract]      
Long-term debt 30,300,000 30,000,000.0  
Back end fees due to PPL and Keppel on Delivery of rigs 300,000    
Convertible Bonds      
Long-term Debt, Current Maturities [Abstract]      
Long-term debt 350,000,000.0 350,000,000.0  
Principal 350,000,000   $ 350,000,000
Delivery Financing from PPL      
Long-term Debt, Current Maturities [Abstract]      
Long-term debt 753,300,000 753,300,000  
Keppel Rigs      
Long-term Debt, Current Maturities [Abstract]      
Long-term debt $ 259,200,000 $ 259,200,000