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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative [Line Items]        
Net change in derivative fair value $ 2,700,000 $ (5,700,000) $ (5,400,000) $ (7,300,000)
Interest Rate Lock Contracts        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) [1]     0 0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)   1,700,000 0 [1],[2] 1,800,000 [1],[2]
Foreign Exchange Forward        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion)       (7,300,000)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) [2]     (11,500,000) 6,500,000
Foreign Exchange Forward | Contract Drilling        
Derivative [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) 500,000 (3,400,000) (2,000,000.0) (7,100,000)
Foreign Exchange Forward | Depreciation Expense        
Derivative [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)   200,000 13,500,000 600,000
Cash Flow Hedges        
Derivative [Line Items]        
Net change in derivative fair value 2,700,000      
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) 2,700,000 (5,700,000) (5,400,000) (7,300,000)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) (500,000) 4,900,000 $ (11,500,000) [2] $ 8,300,000 [2]
Cash Flow Hedges | Foreign Exchange Forward        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion)   (5,700,000)    
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) [2] $ (500,000) $ 3,200,000    
[1] During the nine months ended September 30, 2020, $2.0 million of losses were reclassified from AOCI into contract drilling expense and $13.5 million of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations. During the nine months ended September 30, 2019, $7.1 million of losses were reclassified from AOCI into contract drilling expense and $0.6 million of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations.
[2] Changes in the fair value of cash flow hedges are recorded in AOCI.  Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.(2)Losses on interest rate lock derivatives reclassified from AOCI into income were included in interest expense, net, in our condensed consolidated statements of operations.