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Revenue from Contracts with Customers Narrative (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net			$ 99.6
Early Termination Fee Received			$ 51.0
Minimum
Disaggregation of Revenue [Line Items]
Drilling Contracts, Term			1 month
Maximum
Disaggregation of Revenue [Line Items]
Drilling Contracts, Term			5 years
Upfront Rig Mobilizations And Certain Contract Preparation [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net			$ 85.1	$ 57.3
Capitalized Contract Cost, Amortization	$ 7.6	$ 22.0	92.9	61.7
Deferred Certification Costs [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net			14.5	16.2
Capitalized Contract Cost, Amortization	$ 3.1	$ 0.7	$ 12.7	$ 4.7

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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