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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, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Mar. 31, 2016

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

$ 399.0

$ 430.9

$ 458.5

$ 417.0

$ 454.2

$ 460.2

$ 457.5

$ 471.1

$ 1,705.4

$ 1,843.0

$ 2,776.4

Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

1,705.4

1,843.0

2,776.4

Floaters [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

1,013.5

1,143.5

1,771.1

Jackups Member

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

630.9

640.3

929.5

Angola [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

$ 285.7

$ 445.7

552.1

Angola [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

87.00%

86.00%

88.00%

AUSTRALIA | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

$ 283.9

$ 206.7

222.8

AUSTRALIA | Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

95.00%

92.00%

87.00%

Us Gulf Of Mexico [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[2]

$ 214.7

$ 149.8

$ 531.7

Us Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

30.00%

29.00%

82.00%

Us Gulf Of Mexico [Member] | Jackups Member | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

42.00%

31.00%

7.00%

United Kingdom [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[3]

$ 192.6

$ 164.6

$ 246.2

SAUDI ARABIA | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

182.2

171.8

210.6

Brazil [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[4]

139.6

196.2

298.0

EGYPT | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

31.2

214.8

141.2

Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

$ 375.5

$ 293.4

$ 573.8

[1]	For the years ended December 31, 2018, 2017 and 2016, 86%, 88% and 87% of revenues earned in Angola, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackup segment.
[2]	For the years ended December 31, 2018, 2017 and 2016, 92%, 87% and 95% of revenues earned in Australia, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackup segment.
[3]	For the years ended December 31, 2018, 2017 and 2016, all revenues were attributable to our Jackup segment.
[4]	For the years ended December 31, 2018, 2017 and 2016, 30%, 29% and 82% of revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment, 42%, 31% and 7% of revenues were attributable to our Jackup segment, respectively, and the remaining revenues were attributable to our Other segment, respectively.

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