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 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 3: 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		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($) jackup drillship	Sep. 30, 2020 USD ($)	Apr. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) jackup drillship	Sep. 30, 2021 USD ($) jackup drillship	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Rigs Owned by ARO \| jackup	7			7	7
Total Number Of Contract Drilling Rigs	59			59	59
Number of jackups leased by ARO \| jackup	8			8	8
Contracts Terms On Purchased Rigs					15 years
Number of Newbuild Jackup Rigs \| jackup	20			20	20
Order Period					10 years
ARO Rigs Under Construction \| drillship	2			2	2
Cost of ARO newbuild jackups, each	$ 176.0			$ 176.0	$ 176.0
Maximum Contingent Contributions To Joint Venture	1,250.0			1,250.0	$ 1,250.0
Minimum Renewal Contract Terms For NewBuild Rigs					8 years
Equity Method Investment Summarized Financial Information Accounts Receivable	6.5			6.5	$ 6.5		$ 21.6
Equity Method Investment Summarized Financial Information Accounts Payable	14.8			14.8	14.8		30.9
Due from Joint Ventures, Noncurrent	241.3		$ 228.3	241.3	241.3		$ 442.7
Equity Method Investment Summarized Financial Information Interest Income	2.7	$ 4.5	$ 3.5	4.4		$ 13.7
Equity Method Investment Summarized Financial Information Interest Receivable	7.9			7.9	7.9
Equity Method Investment Summarized Financial Information Contract Liabilities	$ 28.5			$ 28.5	$ 28.5
ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| jackup	7			7	7
Middle East & Africa
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs	18			18	18
Middle East & Africa \| ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| jackup	7			7	7
Middle East & Africa \| Work-in-progress \| ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| drillship	2			2	2
ARO
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%			50.00%	50.00%