Summary of Significant Accounting Policies - Schedule of Assets Recognized in Consolidated Balance Sheets Related to Non-Consolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Investments	$ 10,231.6	$ 11,152.7
Total assets	28,195.6	29,116.0
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Investments	714.7	776.5
Accrued performance allocations	768.5	756.0
Management fee receivables	65.3	57.2
Total assets	$ 1,548.5	$ 1,589.7

Amount of asset recognized for present right to economic benefit.

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+ Details