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Other Financial Information (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) item
Other Financial Information [Line Items] |  |  |
Net gains (losses) from foreign currency transactions | $ (75.4) | $ 59.7 | $ 87.9
Deepwater rig contract exit costs |  |  | $ 282.0
Payment of contract exit costs | 266.7 |  |
Write down of accrued contract exit costs | $ 6.1 | $ 4.3 |
Gulf Of Mexico [Member] |  |  |
Other Financial Information [Line Items] |  |  |
Number of deepwater drilling rigs | item |  |  | 2

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