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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross	$ 23.8	$ 23.3	$ 23.0
Accumulated amortization	(12.9)	(11.8)
Net	10.9	11.5
Customer relationships
Finite-Lived Intangible Assets
Gross	15.6	15.6	15.2
Accumulated amortization	(7.6)	(7.0)
Net	8.0	8.6
Technology and trading related
Finite-Lived Intangible Assets
Gross	8.2	7.7	$ 7.8
Accumulated amortization	(5.3)	(4.8)
Net	$ 2.9	$ 2.9

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