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Acquisition Of Pride International, Inc. (Business Acquisition, Pro Forma Information) (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 9 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Acquisition Of Pride International, Inc. [Abstract] |  |  |  |  |
Revenues | $ 898.0 | [1] | $ 791.9 | $ 2,531.2 | $ 2,410.0
Net income | $ 189.4 | [1] | $ 172.8 | $ 401.6 | $ 629.8
Earnings per share - basic | $ 0.81 | [1] | $ 0.75 | $ 1.73 | $ 2.73
Earnings per share - diluted | $ 0.81 | [1] | $ 0.75 | $ 1.73 | $ 2.73
[1] | Our actual results and our pro forma results differ for the quarter ended September 30, 2011 due to the fact the pro forma results assume the acquisition of Pride occurred on January 1, 2010, resulting in differing amortization periods associated with acquired drilling contract intangible assets and liabilities.

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