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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 2,369.0	$ 2,362.6	$ 1,784.2
Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,369.0	2,362.6	1,784.2
Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,260.6	1,440.7	948.7
Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	912.8	754.9	659.6
Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	195.6	167.0	175.9
Us Gulf Of Mexico [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	342.4	367.4	352.8
Us Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	223.3	245.4	220.9
Us Gulf Of Mexico [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	10.3	27.2
Us Gulf Of Mexico [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	119.1	111.7	104.7
United Kingdom | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	391.8	375.2	267.2
United Kingdom | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0
United Kingdom | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	391.8	375.2	267.2
United Kingdom | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0
Angola | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	293.5	196.7	210.9
Angola | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	219.5	196.7	210.9
Angola | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	74.0	0.0	0.0
Angola | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0
Brazil | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	587.3	497.9	195.0
Brazil | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	587.3	497.9	195.0
Brazil | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0
Brazil | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0
Australia (2) | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	274.1	276.4	186.9
Australia (2) | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	145.9	172.1	157.0
Australia (2) | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	128.2	104.3	29.9
Australia (2) | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	0.0	0.0	0.0
Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	479.9	649.0	571.4
Other Geographic Areas [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	84.6	328.6	164.9
Other Geographic Areas [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	318.8	265.1	335.3
Other Geographic Areas [Member] | Managed Rig | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 76.5	$ 55.3	$ 71.2

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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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