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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	$ 12,125.9	$ 13,209.3
Drilling rigs and equipment
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	11,497.2	12,584.4
Work-in-progress
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	444.2	446.1
Other
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	$ 184.5	$ 178.8

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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