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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Gross	$ 23.3	$ 23.0	$ 22.6
Accumulated amortization	(11.8)	(11.0)
Net	11.5	12.0
Customer relationships
Finite-Lived Intangible Assets
Gross	15.6	15.2	15.2
Accumulated amortization	(7.0)	(6.6)
Net	8.6	8.6
Technology and trading related
Finite-Lived Intangible Assets
Gross	7.7	7.8	$ 7.4
Accumulated amortization	(4.8)	(4.4)
Net	$ 2.9	$ 3.4

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