Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 443.0	$ 419.1	$ 1,306.5	$ 1,231.3
US [Member]
Disaggregation of Revenue [Line Items]
Revenues	295.1	275.9	866.2	812.5
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	78.0	71.2	227.4	207.0
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	46.8	47.0	142.3	136.9
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 23.1	$ 25.0	$ 70.6	$ 74.9

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- 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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