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Share Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense		$ 0.7	$ 11.7	$ 6.7
Share options award, outstanding	313,377
Operating Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	$ 4.8	3.6	15.8	10.7
Contract Drilling [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	2.4	1.6	6.8	3.9
General And Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	$ 2.4	$ 2.0	$ 9.0	$ 6.8
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	319,641
Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation cost, weighted-average period, years			1 year 2 months 12 days
Share option awards, exercisable, increment			3 years
Unrecognized compensation cost on awards			$ 10.1
Granted (in dollars per share)		$ 15.93	$ 62.09	$ 38.08
Non Vested Share Awards, Equity Classified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation cost, weighted-average period, years			1 year 3 months 18 days
Unrecognized compensation cost on awards			$ 23.2
Minimum \| Predecessor time-based share and cash settled awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			33.00%
Management Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	9,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			6,800,000
Management Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Awards, Performance Targets			200.00%	150.00%
Management Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Awards, Performance Targets				0.00%
Non Vested Share Awards, Equity Classified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)		$ 26.07	$ 63.22	$ 45.39
Vested (in shares)			366,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			758,000,000	861,000,000