Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Property And Equipment (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment	$ 15,332.1				$ 12,992.5				$ 15,332.1	$ 12,992.5
Loss on impairment	182.9	$ 0.0	$ 0.0	$ 0.0					182.9	0.0	$ 2,746.4
Depreciation expense	119.5	$ 108.2	$ 107.9	$ 109.2	110.2	$ 109.4	$ 112.4	$ 113.3	444.8	445.3	572.5
Continuing Operations [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use											2,500.0
Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets to be Disposed of											$ 148.6
Work in progress
Property, Plant and Equipment [Line Items]
Property and equipment	2,876.3				1,744.3				2,876.3	1,744.3
Work in progress \| Jackup Rigs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	423.6				415.4				423.6	415.4
Work in progress \| Ultra Deepwater Drillships [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	2,000.0				1,100.0				2,000.0	1,100.0
Work in progress \| Premium Jackup Rigs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	321.6				85.2				321.6	85.2
Drilling rigs and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 12,272.4				$ 11,067.4				$ 12,272.4	$ 11,067.4