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Equity Method Investment In ARO Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 drillship	Sep. 30, 2025 jackup	Sep. 30, 2025	Dec. 31, 2024 USD ($)	Jan. 31, 2020 drillship
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs							48
Number of Newbuild Jackup Rigs | jackup						20
Order Period			10 years
Number of ARO newbuild rigs ordered | drillship									2
ARO Rigs Under Construction | drillship					1
Shareholder Notes Payable, Term			10 years
Debt Instrument, Basis Spread on Variable Rate			2.10%
Accounts payable - trade	$ 327.1		$ 327.1					$ 328.5
Accretion of Discount on the Notes Receivable			18.5	$ 33.8
Loss on impairment	0.0	$ 0.0	7.8	0.0
ARO Rig Currently Under Construction					1	3
ARO
Schedule of Equity Method Investments [Line Items]
Loss on impairment		28.4		28.4
ARO
Schedule of Equity Method Investments [Line Items]
Total Number Of Contract Drilling Rigs | drillship					9
Total Number Of Contract Drilling Rigs, Leased | drillship					7
Total Number Of Contract Drilling Rigs, Newbuild | drillship					1
Lease Revenue From Related Party	22.5	$ 11.3	52.9	$ 42.9
Accounts payable - trade	59.7		59.7					43.1
Principal amount	$ 376.6		$ 376.6					$ 376.6
ARO
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage							50.00%

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