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	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) jackup drillship	Jun. 30, 2020 USD ($)	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) jackup drillship	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Rigs Owned by ARO \| jackup		7			7
Total Number Of Contract Drilling Rigs		60			60
Number of jackups leased by ARO \| jackup		9			9
Contracts Terms On Purchased Rigs					15 years
Number of Newbuild Jackup Rigs \| jackup		20			20
Order Period					10 years
ARO Rigs Under Construction \| drillship		2			2
Cost of ARO newbuild jackups, each		$ 176.0			$ 176.0
Maximum Contingent Contributions To Joint Venture		1,250.0			$ 1,250.0
Minimum Renewal Contract Terms For NewBuild Rigs					8 years
Equity Method Investment Summarized Financial Information Accounts Receivable		21.0			$ 21.0		$ 21.6
Equity Method Investment Summarized Financial Information Accounts Payable		38.6			38.6		30.9
Due from Joint Ventures, Noncurrent	$ 228.3	234.3		$ 228.3	234.3		$ 442.7
Equity Method Investment Summarized Financial Information Interest Income	$ 0.9	1.7	$ 4.6	$ 3.5		$ 9.2
Equity Method Investment Summarized Financial Information Interest Receivable		$ 5.2			$ 5.2
ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| jackup		7			7
Middle East & Africa
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs		19			19
Middle East & Africa \| ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs \| jackup		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
ARO
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%			50.00%