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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Assets (Liabilities), at Fair Value, Net $ (32.7)   $ (32.7)   $ (26.3)
Maturity period of derivatives (in months)     18 months    
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months     $ (16.6)    
Fair Value, Inputs, Level 2 [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Assets (Liabilities), at Fair Value, Net (32.7)   (32.7)   $ (26.3)
Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (5.8) $ 1.4 (15.9) $ 3.3  
Designated as Hedging Instrument [Member] | Foreign Exchange [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Aggregate cash flow hedges outstanding 329.9   329.9    
Cash flow hedges outstanding for British pounds 158.4   158.4    
Cash flow hedges outstanding for Brazilian reals 72.7   72.7    
Cash flow hedges outstanding for euros 39.2   39.2    
Cash flow hedges outstanding for Singapore dollars 18.3   18.3    
Cash flow hedges outstanding for Australian dollars 32.0   32.0    
Cash flow hedges outstanding for other currencies 9.3   9.3    
Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net gains (losses) on derivatives not designated as hedging instruments (4.2) (15.4) (13.2) (15.1)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Aggregate cash flow hedges outstanding 155.5   155.5    
Cash flow hedges outstanding for British pounds 11.8   11.8    
Cash flow hedges outstanding for euros 85.1   85.1    
Cash flow hedges outstanding for Indonesian rupiah 9.5   9.5    
Cash flow hedges outstanding for Mexican Pesos 13.3   13.3    
Cash flow hedges outstanding for Swiss francs 13.8   13.8    
Cash flow hedges outstanding for other currencies 22.0   22.0    
Foreign Exchange Forward [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [1] (5.7) [2] 1.4 [2] (15.3) [3] 3.5 [3]  
Contract Drilling [Member] | Foreign Exchange Forward [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (5.9) $ 1.2 $ (15.9) $ 2.9  
[1] 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] During the three-month period ended September 30, 2015, $5.9 million of losses were reclassified from AOCI into contract drilling expense and $200,000 of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations. During the three-month period ended September 30, 2014, $1.2 million of gains were reclassified from AOCI into contract drilling expense and $200,000 of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations.
[3] During the nine-month period ended September 30, 2015, $15.9 million of losses were reclassified from AOCI into contract drilling expense and $600,000 of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations. During the nine-month period ended September 30, 2014, $2.9 million of gains were reclassified from AOCI into contract drilling expense and $600,000 of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations.