Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gross cost at January 1	$ 291.1	$ 295.2
Additions	22.4	2.7
Written down in the year	0.0	(4.1)
Exchange effect	1.6	(2.7)
Gross cost at December 31	315.1	291.1	$ 295.2
Accumulated amortization at January 1	(246.1)	(237.7)
Amortization expense	(10.6)	(14.0)	(16.0)
Written down in the year	0.0	4.1
Exchange effect	(1.1)	1.5
Accumulated amortization at December 31	(257.8)	(246.1)	$ (237.7)
Other intangible assets	$ 57.3	$ 45.0