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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.

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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

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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.

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