v2.4.0.6
Derivative Instruments (Schedule Of Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2011
Mar. 31, 2010
Interest Rate Lock Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion)    [1]    [1]
(Loss) Gain Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) (0.1) [1] (0.1) [1]
(Loss) Gain Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)    [1]    [1],[2]
Foreign Currency Forward Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) 2.9 [3] (1.4) [3]
(Loss) Gain Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) 0.9 [3] 1.4 [3]
(Loss) Gain Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) (0.4) [3] 0 [2],[3]
Cash Flow Hedging [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) 2.9 [3] (1.4) [3]
(Loss) Gain Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) 0.8 [3] 1.3 [3]
(Loss) Gain Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ (0.4) [3] $ 0 [2],[3]
[1] Gains and losses on derivatives reclassified from AOCI into income (effective portion) were included in other income, net, in our condensed consolidated statements of income.
[2] Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other income, net, in our condensed consolidated statements of income.
[3] Gains and losses on derivatives reclassified from AOCI into income (effective portion) were included in contract drilling expense in our condensed consolidated statements of income.