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Intangible assets (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure of detailed information about intangible assets [abstract]

Schedule of components and movements during the period in intangible assets

Cost:

		Balance at January 1, 2022				Additions				Effect of movements in exchange rates				Balance at December 31, 2022
																		US $ in millions
Goodwill																			6.3				4.0				(0.7	)			9.6
Software (mostly development costs)			211.6				27.3				(0.1	)			238.8
Other intangible assets			4.5												4.5
Total			222.4				31.3				(0.8	)			252.9

Amortization and impairment losses:
		Balance at January 1, 2022				Amortization				Effect of movements in exchange rates				Balance at December 31, 2022
																		US $ in millions
Goodwill
Software (mostly development costs)			145.6				10.4				(0.1	)			155.9
Other intangible assets			3.0				1.1								4.1
Total			148.6				11.5				(0.1	)			160.0

Net carrying amounts:
		Balance at January 1, 2022												Balance at December 31, 2022
						US $ in millions																US $ in millions
Goodwill							6.3																9.6
Software (mostly development costs)			66.0												82.9
Other intangible assets			1.5												0.4
Total			73.8												92.9

Cost:
		Balance at January 1, 2021				Additions				Disposals				Effect of movements in exchange rates				Balance at December 31, 2021
																						US $ in millions
Goodwill																							7.6												(1.3	)			6.3
Software (mostly development costs)			194.5				17.1												211.6
Dry docking			4.5								(4.5	)
Other intangible assets			3.4				1.1												4.5
Total			210.0				18.2				(4.5	)			(1.3	)			222.4

Amortization and impairment losses:
		Balance at January 1, 2021				Amortization				Disposals				Effect of movements in exchange rates				Balance at December 31, 2021
																						US $ in millions
Goodwill
Software (mostly development costs)			136.3				9.3												145.6
Dry docking			4.5								(4.5	)
Other intangible assets			2.7				0.3												3.0
Total			143.5				9.6				(4.5	)							148.6

Net carrying amounts:
		Balance at January 1, 2021																Balance at December 31, 2021
						US $in millions																				US $in millions
Goodwill							7.6																				6.3
Software (mostly development costs)			58.2																66.0
Dry docking
Other intangible assets			0.7																1.5
Total			66.5																73.8

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Schedule of increase (decrease) in the recoverable amount of cash generating unit

		Increase				Decrease
		By 100 bps
		US $ in millions
Discount rate			(625	)			766
Terminal growth rate			512				(406	)

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- References

No definition available.

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- Definition

The disclosure of intangible assets and goodwill. [Refer: Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Tabular disclosure of increase (decrease) in the recoverable amount of cash generating unit.

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