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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (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
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 397.4	$ 835.0	$ 1,784.2	$ 1,602.5
Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	397.4	835.0	1,784.2	1,602.5
Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	115.7	254.5	948.7	700.5
Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	232.4	487.1	659.6	744.2
Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	49.3	93.4	175.9	157.8
Us Gulf Of Mexico [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	74.4	109.9	352.8	351.2
Us Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	47.9	52.8	220.9	230.9
Us Gulf Of Mexico [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.2	0.7	27.2	21.3
Us Gulf Of Mexico [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	26.3	56.4	104.7	99.0
United Kingdom [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	75.7	185.2	267.2	264.5
United Kingdom [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
United Kingdom [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	75.7	185.2	267.2	264.5
United Kingdom [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
Angola [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	20.5	19.4	210.9	78.5
Angola [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	20.5	19.4	210.9	78.5
Angola [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
Angola [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
Brazil [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	38.6	195.0	111.5
Brazil [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	38.6	195.0	111.5
Brazil [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
Brazil [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1.0	75.5	186.9	143.0
AUSTRALIA | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.8	46.2	157.0	113.0
AUSTRALIA | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.2	29.3	29.9	30.0
AUSTRALIA | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
SAUDI ARABIA | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	53.5	92.3	112.4	137.1
SAUDI ARABIA | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
SAUDI ARABIA | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	30.5	55.3	41.2	78.3
SAUDI ARABIA | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	23.0	37.0	71.2	58.8
MEXICO | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	44.3	77.8	104.6	72.0
MEXICO | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	21.6	37.0	65.9	13.9
MEXICO | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	22.7	40.8	38.7	58.1
MEXICO | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
NORWAY | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	73.3	123.9	2.4	114.6
NORWAY | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
NORWAY | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	73.3	123.9	2.4	114.6
NORWAY | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0	0.0
Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	54.7	112.4	352.0	330.1
Other Geographic Areas [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	24.9	60.5	99.0	152.7
Other Geographic Areas [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	29.8	51.9	253.0	177.4
Other Geographic Areas [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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