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Derivative Instruments (Estimated Net Gains Associated With Derivative Instruments, Net Of Tax That Will Be Reclassified To Earnings Within Twelve Months) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2011
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Net Unrealized Gains To Be Reclassified To Contract Drilling Expense [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |
| Net gains (losses) to be reclassified to earnings | $ 1.8 |
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Net Realized Losses To Be Reclassified To Other Income, Net [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |
| Net gains (losses) to be reclassified to earnings | (0.3) |
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Net Gain (Loss) To Be Reclassified Within Twelve Months [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |
| Net gains (losses) to be reclassified to earnings | $ 1.5 |