Amounts due from an entity in which the reporting entity shares joint control with another party or group, due after 1 year (or 1 business cycle).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: 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(11))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

Equity Method Investment In ARO Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) drillship jackup	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Rigs Owned by ARO \| jackup	7
Total Number Of Contract Drilling Rigs	61
ARO Rigs Under Construction \| drillship	2
Number of jackups leased by ARO \| jackup	9
Contracts Terms On Purchased Rigs	15 years
Number of Newbuild Jackup Rigs \| jackup	20
Order Period	10 years
Cost of ARO newbuild jackups, each	$ 176.0
Maximum Contingent Contributions To Joint Venture	$ 1,250.0
Minimum Renewal Contract Terms For NewBuild Rigs	8 years
Equity Method Investment Summarized Financial Information Accounts Receivable	$ 13.9		$ 21.6
Equity Method Investment Summarized Financial Information Accounts Payable		$ 34.9	30.9
LONG-TERM NOTES RECEIVABLE FROM ARO	442.7		$ 442.7
Equity Method Investment Summarized Financial Information Interest Income	2.6	$ 4.6
Equity Method Investment Summarized Financial Information Interest Receivable	$ 2.6
ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| jackup	7
Middle East & Africa
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs	19
Middle East & Africa \| ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| jackup	7
Middle East & Africa \| Work-in-progress \| ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| drillship	2
ARO
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%