Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Other Intangible Assets

The following table analyzes other intangible assets movement for 2023 and 2022.

(in millions)	2023			2022
Gross cost at January 1	$	291.1		$	295.2
Additions		22.4			2.7
Written down in the year		—			(4.1	)
Exchange effect		1.6			(2.7	)
Gross cost at December 31		315.1			291.1
Accumulated amortization at January 1		(246.1	)		(237.7	)
Amortization expense		(10.6	)		(14.0	)
Written down in the year		—			4.1
Exchange effect		(1.1	)		1.5
Accumulated amortization at December 31		(257.8	)		(246.1	)
Net book amount at December 31	$	57.3		$	45.0

Schedule of Amortization Expense

Other intangible assets at December 31, 2023 were:

(in millions)	Gross carrying amount		Accumulated amortization
Product rights	$	34.0	$	(34.0	)
Brand names		8.9		(8.4	)
Technology		55.1		(42.3	)
Customer relationships		131.6		(105.4	)
Internally developed software		60.5		(42.7	)
Other		25.0		(25.0	)
	$	315.1	$	(257.8	)

Other intangible assets at December 31, 2022 were:

(in millions)	Gross carrying amount		Accumulated amortization
Product rights	$	34.0	$	(34.0	)
Brand names		8.9		(7.8	)
Technology		55.1		(40.0	)
Customer relationships		122.9		(96.9	)
Internally developed software		45.2		(42.4	)
Other		25.0		(25.0	)
	$	291.1	$	(246.1	)

Future amortization expense is estimated to be as follows for the next five years:

(in millions)
2024	$	11.8
2025	$	10.2
2026	$	10.0
2027	$	6.5
2028	$	6.1