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Segment information - Customer Revenue by Classes of Similar Products or Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Revenue	$ 2,008.4	$ 2,015.4	$ 1,979.9
Operating Segments
Revenue from External Customer [Line Items]
Revenue	1,915.4	1,927.8	1,891.9
Segment Reconciling Items
Revenue from External Customer [Line Items]
Revenue	$ 93.0	$ 87.6	$ 88.0

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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