Investments - Principal Investment Income (Loss) from Equity Method Investments (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2023	May 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Total			$ 3,024.1	$ 2,922.0
Total investments in NGP
Schedule of Investments [Line Items]
Total			916.2	1,015.7
Performance fees, income (loss)			65.5	560.7	$ 3.8
Carlyle FRL
Schedule of Investments [Line Items]
Investment loss		$ 176.9	104.0
Total			595.4
Carlyle FRL | Fortitude Holdings
Schedule of Investments [Line Items]
Percentage ownership	10.50%	13.50%
Carlyle FRL | Fortitude Holdings | Maximum
Schedule of Investments [Line Items]
Percentage ownership		19.90%
Carlyle FRL | Fortitude Holdings | Minimum
Schedule of Investments [Line Items]
Percentage ownership		13.50%
Global Private Equity
Schedule of Investments [Line Items]
Total			1,798.3	1,853.5
Global Credit
Schedule of Investments [Line Items]
Total			987.4	974.2
Global Credit | Fortitude Holdings
Schedule of Investments [Line Items]
Total			595.4	646.0
Global Credit | Carlyle FRL
Schedule of Investments [Line Items]
Investment loss			$ 104.0	$ 176.9
Global Credit | Carlyle FRL | Fortitude Holdings | Maximum
Schedule of Investments [Line Items]
Percentage ownership			13.50%	19.90%
Global Credit | Carlyle FRL | Fortitude Holdings | Minimum
Schedule of Investments [Line Items]
Percentage ownership			10.50%	13.50%
Global Investment Solutions
Schedule of Investments [Line Items]
Total			$ 238.4	$ 94.3
Principal investment income (loss) from equity method investments
Schedule of Investments [Line Items]
Investment income (loss)			116.6	619.5	557.0
Principal investment income (loss) from equity method investments | Global Private Equity
Schedule of Investments [Line Items]
Investment income (loss)			157.6	744.8	346.7
Principal investment income (loss) from equity method investments | Global Credit
Schedule of Investments [Line Items]
Investment income (loss)			(60.0)	(134.8)	183.4
Principal investment income (loss) from equity method investments | Global Investment Solutions
Schedule of Investments [Line Items]
Investment income (loss)			$ 19.0	$ 9.5	$ 26.9