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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The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life.

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Costs of generating revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The net result for the period of deducting operating expenses from operating revenues.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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-Glossary Investing Activities

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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Segment Information (Schedule Of Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 1,159.8us-gaap_RevenueOilAndGasServices	$ 1,201.4us-gaap_RevenueOilAndGasServices	$ 1,136.6us-gaap_RevenueOilAndGasServices	$ 1,066.7us-gaap_RevenueOilAndGasServices	$ 1,138.0us-gaap_RevenueOilAndGasServices	$ 1,119.9us-gaap_RevenueOilAndGasServices	$ 1,076.1us-gaap_RevenueOilAndGasServices	$ 989.4us-gaap_RevenueOilAndGasServices	$ 4,564.5us-gaap_RevenueOilAndGasServices	$ 4,323.4us-gaap_RevenueOilAndGasServices	$ 3,638.8us-gaap_RevenueOilAndGasServices
Operating expenses - Contract drilling (exclusive of depreciation)	514.0us-gaap_CostOfServicesOilAndGas	500.2us-gaap_CostOfServicesOilAndGas	542.5us-gaap_CostOfServicesOilAndGas	520.2us-gaap_CostOfServicesOilAndGas	500.4us-gaap_CostOfServicesOilAndGas	499.2us-gaap_CostOfServicesOilAndGas	496.1us-gaap_CostOfServicesOilAndGas	451.4us-gaap_CostOfServicesOilAndGas	2,076.9us-gaap_CostOfServicesOilAndGas	1,947.1us-gaap_CostOfServicesOilAndGas	1,642.8us-gaap_CostOfServicesOilAndGas
Asset Impairment Charges	3,515.2us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	703.5us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges					4,218.7us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Depreciation	139.4us-gaap_CostOfServicesDepreciation	135.2us-gaap_CostOfServicesDepreciation	132.2us-gaap_CostOfServicesDepreciation	131.1us-gaap_CostOfServicesDepreciation	127.5us-gaap_CostOfServicesDepreciation	124.7us-gaap_CostOfServicesDepreciation	124.0us-gaap_CostOfServicesDepreciation	120.0us-gaap_CostOfServicesDepreciation	537.9us-gaap_CostOfServicesDepreciation	496.2us-gaap_CostOfServicesDepreciation	443.8us-gaap_CostOfServicesDepreciation
General and administrative	28.3us-gaap_GeneralAndAdministrativeExpense	29.3us-gaap_GeneralAndAdministrativeExpense	36.2us-gaap_GeneralAndAdministrativeExpense	38.1us-gaap_GeneralAndAdministrativeExpense	35.2us-gaap_GeneralAndAdministrativeExpense	37.4us-gaap_GeneralAndAdministrativeExpense	36.4us-gaap_GeneralAndAdministrativeExpense	37.8us-gaap_GeneralAndAdministrativeExpense	131.9us-gaap_GeneralAndAdministrativeExpense	146.8us-gaap_GeneralAndAdministrativeExpense	148.9us-gaap_GeneralAndAdministrativeExpense
OPERATING INCOME	(3,037.1)us-gaap_OperatingIncomeLoss	536.7us-gaap_OperatingIncomeLoss	(277.8)us-gaap_OperatingIncomeLoss	377.3us-gaap_OperatingIncomeLoss	474.9us-gaap_OperatingIncomeLoss	458.6us-gaap_OperatingIncomeLoss	419.6us-gaap_OperatingIncomeLoss	380.2us-gaap_OperatingIncomeLoss	(2,400.9)us-gaap_OperatingIncomeLoss	1,733.3us-gaap_OperatingIncomeLoss	1,403.3us-gaap_OperatingIncomeLoss
Property and equipment, net	12,534.8us-gaap_PropertyPlantAndEquipmentNet				14,311.0us-gaap_PropertyPlantAndEquipmentNet				12,534.8us-gaap_PropertyPlantAndEquipmentNet	14,311.0us-gaap_PropertyPlantAndEquipmentNet	13,145.6us-gaap_PropertyPlantAndEquipmentNet
Capital expenditures									1,568.8	1,763.5	1,713.2
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues									2,697.6	2,659.6	2,149.1
Operating expenses - Contract drilling (exclusive of depreciation)									1,201.2	1,126.0	894.5
Asset Impairment Charges									3,982.3
Depreciation									358.1	342.2	283.3
General and administrative									0	0	0
OPERATING INCOME									(2,844.0)	1,191.4	971.3
Property and equipment, net	9,462.3				11,303.4				9,462.3	11,303.4	10,727.6
Capital expenditures									856.2	1,028.6	1,519.4
Jackups [Member]
Segment Reporting Information [Line Items]
Revenues									1,774.6	1,588.7	1,406.9
Operating expenses - Contract drilling (exclusive of depreciation)									807.4	762.6	687.2
Asset Impairment Charges									236.4
Depreciation									171.2	147.5	151.6
General and administrative									0	0	0
OPERATING INCOME									559.6	678.6	568.1
Property and equipment, net	2,995.3				2,961.6				2,995.3	2,961.6	2,389.8
Capital expenditures									667.7	708.3	191.1
Other [Member]
Segment Reporting Information [Line Items]
Revenues									92.3	75.1	82.8
Operating expenses - Contract drilling (exclusive of depreciation)									68.3	58.5	61.1
Asset Impairment Charges									0
Depreciation									0	0	0
General and administrative									0	0	0
OPERATING INCOME									24.0	16.6	21.7
Property and equipment, net	0				0				0	0	0
Capital expenditures									0	0	0
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
Revenues									4,564.5	4,323.4	3,638.8
Operating expenses - Contract drilling (exclusive of depreciation)									2,076.9	1,947.1	1,642.8
Asset Impairment Charges									4,218.7
Depreciation									529.3	489.7	434.9
General and administrative									0	0	0
OPERATING INCOME									(2,260.4)	1,886.6	1,561.1
Property and equipment, net	12,457.6				14,265.0				12,457.6	14,265.0	13,117.4
Capital expenditures									1,523.9	1,736.9	1,710.5
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Revenues									0	0	0
Operating expenses - Contract drilling (exclusive of depreciation)									0	0	0
Asset Impairment Charges									0
Depreciation									8.6	6.5	8.9
General and administrative									131.9	146.8	148.9
OPERATING INCOME									(140.5)	(153.3)	(157.8)
Property and equipment, net	77.2				46.0				77.2	46.0	28.2
Capital expenditures									$ 44.9	$ 26.6	$ 2.7