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Segment Information - Reconciliation of Segment Revenue to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 464.6	$ 461.2	$ 1,457.8	$ 1,422.9
Total segment revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	396.6	390.1	1,244.0	1,207.7
Other revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 68.0	$ 71.1	$ 213.8	$ 215.2

X

- Definition

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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