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Segment Information - Reconciliation of Segment Revenue to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 488.0	$ 495.2	$ 1,515.1	$ 1,449.4
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	409.4	411.8	1,283.2	1,215.4
Other revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	78.6	83.4	233.3	234.1
Elimination of intercompany revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 0.0	$ 0.0	$ (1.4)	$ (0.1)

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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