Nature of Business and Significant Accounting Policies - Performance-Based Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Performance-based fees not recognized as revenue	$ 4.5		$ 4.5		$ 4.9
Performance-based revenue recognized	1.7	$ 1.0	3.2	$ 2.1
Revenue recognized related to services provided in prior period	0.6		1.3
Performance-based revenue recognized but not yet settled with customers	$ 2.0	$ 4.4	$ 2.0	$ 4.4
Enterprise
Disaggregation of Revenue [Line Items]
Measurement period			1 year
Enterprise | Minimum
Disaggregation of Revenue [Line Items]
Settlement process term			6 months
Enterprise | Maximum
Disaggregation of Revenue [Line Items]
Settlement process term			8 months