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Property And Equipment (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) rigs | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |
Property and equipment | $ 15,517.0 |  |  |  | $ 15,332.1 |  |  |  | $ 15,517.0 | $ 15,332.1 |
Loss on impairment | 40.3 | $ 0.0 | $ 0.0 | $ 0.0 | 182.9 | $ 0.0 | $ 0.0 | $ 0.0 | 40.3 | $ 182.9 | $ 0.0
Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Drilling Rigs With Impairment | rigs |  |  |  |  |  |  |  |  |  | 1 |
Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 779.2 |  |  |  | 2,876.3 |  |  |  | 779.2 | $ 2,876.3 |
Construction in Progress [Member] | Ultra Deepwater Drillships [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 416.8 |  |  |  | 2,000.0 |  |  |  | 416.8 | 2,000.0 |
Construction in Progress [Member] | Premium Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | $ 352.4 |  |  |  | 321.6 |  |  |  | $ 352.4 | 321.6 |
Construction in Progress [Member] | Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  | $ 423.6 |  |  |  |  | $ 423.6 |
Moored Semisubmersible Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Drilling Rigs With Impairment | rigs |  |  |  |  |  |  |  |  |  | 2 |

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