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Segment information - Customer Revenue by Classes of Similar Products or Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Revenue	$ 1,979.9	$ 2,054.4	$ 2,026.3
Operating Segments
Revenue from External Customer [Line Items]
Revenue	1,699.9	1,747.2	1,716.9
Other revenue
Revenue from External Customer [Line Items]
Revenue	280.0	308.6	309.5
Elimination of intercompany revenue
Revenue from External Customer [Line Items]
Revenue	$ 0.0	$ (1.4)	$ (0.1)

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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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