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Discontinued Operations (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) rigs | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item | $ | $ (6.9) | $ 2.1 | $ 10.2
Document Period End Date | Dec. 31, 2018 |  |
Jackup Rigs [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number Of Contract Drilling Rigs Sold | 12 |  |
Semisubmersible Rigs [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number Of Contract Drilling Rigs Sold | 5 |  |
Moored Semisubmersible Rigs [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number Of Contract Drilling Rigs Sold | 1 |  |
Ultra Deepwater Drillships [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number Of Contract Drilling Rigs Sold | 2 |  |

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