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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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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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