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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets
Gross	$ 23.0	$ 22.6	$ 23.4
Accumulated amortization	(11.0)	(10.1)
Net	12.0	12.5
Customer relationships
Finite-Lived Intangible Assets
Gross	15.2	15.2	15.2
Accumulated amortization	(6.6)	(6.1)
Net	8.6	9.1
Technology and trading related
Finite-Lived Intangible Assets
Gross	7.8	7.4	$ 8.2
Accumulated amortization	(4.4)	(4.0)
Net	$ 3.4	$ 3.4

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Name Accounting Standards Codification
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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