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Gain on Disposals (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds | $ 5.7 | $ 34.7 | $ 8.5
Book value on disposal | 4.5 | 15.7 | 2.1
(Loss)/gain on disposal | 1.2 | 19.0 | 6.4
Balder |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds | 4.4 | 3.0 |
Book value on disposal | 4.5 |  |
(Loss)/gain on disposal | (0.1) |  |
Rig Related Equipment |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds | 1.3 | 3.3 | 2.5
Book value on disposal | 0.0 | 1.7 | 0.0
(Loss)/gain on disposal | $ 1.3 | 1.6 | 2.5
B152 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  | 7.9 |
Book value on disposal |  | 1.4 |
(Loss)/gain on disposal |  | 6.5 |
Dhabi II |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  | 7.9 |
Book value on disposal |  | 1.6 |
(Loss)/gain on disposal |  | 6.3 |
Atla |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  | 10.0 |
Book value on disposal |  | 5.0 |
(Loss)/gain on disposal |  | 5.0 |
MSS1 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  | 2.2 |
Book value on disposal |  | 2.2 |
(Loss)/gain on disposal |  | 0.0 |
Eir |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  | 3.0 |
Book value on disposal |  | 3.0 |
(Loss)/gain on disposal |  | 0.0 |
B391 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  | 0.4 |
Book value on disposal |  | 0.8 |
(Loss)/gain on disposal |  | $ (0.4) |
Baug |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  |  | 3.0
Book value on disposal |  |  | 0.0
(Loss)/gain on disposal |  |  | 3.0
C20051 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment [Abstract] |  |  |
Net proceeds |  |  | 3.0
Book value on disposal |  |  | 2.1
(Loss)/gain on disposal |  |  | $ 0.9

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- Definition Proceeds From Disposal Of Property, Plant, And Equipment + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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