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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,427.2	$ 2,053.2	$ 1,705.4
Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,427.2	2,053.2	1,705.4
Angola [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 86.3	$ 284.0	$ 285.7
Angola [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	84.00%	87.00%	86.00%
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 117.9	$ 204.2	$ 283.9
AUSTRALIA | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	91.00%	90.00%	92.00%
Us Gulf Of Mexico [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 241.4	$ 301.0	$ 214.7
Us Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	55.00%	46.00%	30.00%
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%	42.00%
United Kingdom [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 211.3	$ 213.1	$ 192.6
SAUDI ARABIA | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 200.8	$ 313.4	182.2
SAUDI ARABIA | Jackups Member | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration Risk, Percentage	63.00%	65.00%
Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 381.0	$ 698.3	546.3
NORWAY | Geographic Concentration Risk [Member] | Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 188.5	$ 39.2	$ 0.0

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