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Other Financial Information (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) item
Other Financial Information [Line Items] |  |  |  |
Net gains (losses) from foreign currency transactions | $ (7.8) | $ (75.4) | $ 59.7 |
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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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 + Details
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