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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member]      
Derivative [Line Items]      
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion) $ 8,500,000 $ 5,400,000 $ 23,600,000
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) (400,000) (12,400,000) (22,200,000)
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) (700,000) 1,900,000 (100,000)
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Lock Contracts [Member]      
Derivative [Line Items]      
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion) [1] 0 0 0
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) [1],[2] (200,000) (200,000) (600,000)
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) [1],[3] 0 0 0
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) [2],[4] (200,000) (12,200,000) (21,600,000)
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) [3],[4] (700,000) 1,900,000 (100,000)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [4] 8,500,000 (5,400,000) (23,600,000)
Derivative, Notional Amount 188,400,000    
Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Net gains on derivatives not designated as hedging instruments 10,000,000 (7,000,000) (17,300,000)
Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 131,100,000    
Contract Drilling [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) (1,100,000) (13,100,000) (22,500,000)
Depreciation Expense [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) 900,000 $ 900,000 $ 900,000
Euro Member Countries, Euro | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 27,000,000    
Euro Member Countries, Euro | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 93,300,000    
Brazil, Brazil Real | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 19,900,000    
Brazil, Brazil Real | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 9,600,000    
Indonesia, Rupiahs | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 7,400,000    
United Kingdom, Pounds | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 82,200,000    
United Kingdom, Pounds | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 5,600,000    
Australia, Dollars | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 47,800,000    
Australia, Dollars | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 5,400,000    
No currency | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 1,100,000    
No currency | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Derivative, Notional Amount $ 9,800,000    
[1] Losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net, in our consolidated statements 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.
[3] Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net, in our consolidated statements of operations.
[4] During the year ended December 31, 2017, $1.1 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of operations. During the year ended December 31, 2016, $13.1 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of operations. During the year ended December 31, 2015, $22.5 million of losses were reclassified from AOCI into contract drilling and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of operations.