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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 397.4	$ 835.0		$ 1,427.2	$ 2,053.2
Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	397.4	835.0		1,427.2	2,053.2
Angola [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	20.5	19.4		$ 86.3	284.0
Angola [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage			84.00%	87.00%
Us Gulf Of Mexico [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 74.4	$ 109.9		$ 241.4	$ 301.0
Us Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	64.00%	48.00%		55.00%	46.00%
Us Gulf Of Mexico [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage				11.00%	28.00%
Us Gulf Of Mexico [Member] | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage		1.00%
United Kingdom [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 75.7	$ 185.2		$ 211.3	$ 213.1
SAUDI ARABIA | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 53.6	$ 92.3		$ 200.8	$ 313.4
SAUDI ARABIA | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	57.00%	60.00%		63.00%	65.00%
Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 55.6	$ 226.5		$ 386.8	$ 829.5
NORWAY | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	73.3	123.9		188.5	39.2
MEXICO | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 44.3	$ 77.8		$ 112.1	$ 73.0
MEXICO | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage				54.00%
MEXICO | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	51.00%	52.00%

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