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Segment Information - Reconciliation of Segment Revenue to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 478.2	$ 476.8	$ 966.0	$ 993.2
Total segment revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	403.9	402.2	812.2	847.4
Other revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 74.3	$ 74.6	$ 153.8	$ 145.8

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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