Investments - Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments [Abstract]
Realized gains (losses)	$ (29.6)	$ 9.6	$ (91.3)
Net change in unrealized gains (losses)	(378.5)	67.0	62.2
Total	$ (408.1)	$ 76.6	$ (29.1)

Amount of realized gain (loss) on investment.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration