Investments - Schedule of Principal Investments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Segment Reporting Information [Line Items]
Total	$ 2,982.3	$ 2,879.5
Global Private Equity
Segment Reporting Information [Line Items]
Total	1,434.7	1,384.4
Global Private Equity \| NGP Management
Segment Reporting Information [Line Items]
Total	652.4	616.0
Global Credit
Segment Reporting Information [Line Items]
Total	1,120.3	1,151.9
Global Credit \| Fortitude Group Holdings, LLC
Segment Reporting Information [Line Items]
Total	729.2	722.4
Carlyle AlpInvest
Segment Reporting Information [Line Items]
Total	$ 427.3	$ 343.2

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.