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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Mar. 31, 2017

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

$ 512.1

$ 551.3

$ 583.9

$ 405.9

$ 399.0

$ 430.9

$ 458.5

$ 417.0

$ 2,053.2

$ 1,705.4

$ 1,843.0

Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

2,053.2

1,705.4

1,843.0

Angola [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

$ 284.0

$ 285.7

445.7

Angola [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

88.00%

87.00%

86.00%

AUSTRALIA | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

$ 204.2

$ 283.9

206.7

AUSTRALIA | Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

87.00%

90.00%

92.00%

Us Gulf Of Mexico [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[2]

$ 301.0

$ 214.7

$ 149.8

Us Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

46.00%

30.00%

29.00%

Us Gulf Of Mexico [Member] | Jackups Member | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

28.00%

42.00%

31.00%

United Kingdom [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[3]

$ 213.1

$ 192.6

$ 164.6

SAUDI ARABIA | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

$ 313.4

182.2

171.8

SAUDI ARABIA | Jackups Member | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

65.00%

SAUDI ARABIA | Other [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

35.00%

Brazil [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[4]

$ 117.8

139.6

196.2

EGYPT | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[4]

40.4

31.2

214.8

Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

$ 579.3

$ 375.5

$ 293.4

[1]	For the years ended December 31, 2019, 65% and 35% of revenues were attributable to our Jackup and Other segments, respectively. For the years ended December 31, 2018 and 2017, all revenues earned were attributable to our Jackup segment.
[2]	For the years ended December 31, 2019, 2018 and 2017, 46%, 30% and 29% of revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment, 28%, 42% and 31% of revenues were attributable to our Jackup segment, respectively, and the remaining revenues were attributable to our Other segment, respectively.
[3]	For the years ended December 31, 2019, 2018 and 2017, all revenues earned in the United Kingdom were attributable to our Jackup segment.
[4]	For the years ended December 31, 2019, 2018 and 2017, 87%, 86% and 88% of revenues earned in Angola, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackup segment.

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