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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Interest Rate Lock Contracts        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) $ 0 $ 0 $ 0 [1] $ 0 [1]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) 1,700,000 (100,000) 1,800,000 [1],[2] (200,000) [1],[2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) 0 0 0 [1],[3] 0 [1],[3]
Foreign Exchange Forward        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) (5,700,000) [4] (1,900,000) [4] (7,300,000) [5] (7,600,000) [5]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) [2] 3,200,000 [4] (600,000) [4] 6,500,000 [5] 2,400,000 [5]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) [3] 0 [4] (300,000) [4] 0 [5] (1,500,000) [5]
Foreign Exchange Forward | Contract Drilling        
Derivative [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) (3,400,000) (800,000) (7,100,000) 1,800,000
Foreign Exchange Forward | Depreciation Expense        
Derivative [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) 200,000 200,000 600,000 600,000
Cash Flow Hedges        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) (5,700,000) (1,900,000) (7,300,000) (7,600,000)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) [2] 4,900,000 (700,000) 8,300,000 2,200,000
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) [3] $ 0 $ (300,000) $ 0 $ (1,500,000)
[1] Losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net, in our condensed consolidated statements of operations.
[2] Changes in the fair value of cash flow hedge derivatives 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.
[3] Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net, in our condensed consolidated statements of operations. As a result of our adoption of Update 2017-12 on January 1, 2019, ineffectiveness is no longer separately measured and recognized. See additional information in Note 1.
[4] During the three-month period ended September 30, 2019, $3.4 million of losses were reclassified from AOCI into contract drilling expense and $0.2 million of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations. During the three-month period ended September 30, 2018, $0.8 million of losses were reclassified from AOCI into contract drilling expense and $0.2 million of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations.
[5] During the nine-month period 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. During the nine-month period ended September 30, 2018, $1.8 million of gains 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.