Supplemental Financial Information - Financial Position (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 1,360.7	$ 2,469.5	$ 987.6
Cash and cash equivalents held at Consolidated Funds	209.0	147.8	148.6
Restricted cash	0.8	5.6	2.0
Corporate treasury investments	20.0	0.0
Accrued performance fees	0.0
Investments, including accrued performance allocations of $7,117.7 and $8,133.0 as of December 31, 2022 and 2021, respectively	10,767.9	10,832.0
Investments of Consolidated Funds	6,894.4	6,661.0
Due from affiliates and other receivables, net	579.4	379.6
Due from affiliates and other receivables of Consolidated Funds, net	101.9	138.8
Fixed assets, net	139.9	143.9
Lease right-of-use assets, net	337.0	361.1
Deposits and other	78.4	61.7
Intangible assets, net	897.8	34.9
Deferred tax assets	15.8	14.5
Total assets	21,403.0	21,250.4	15,644.8
Liabilities and equity
Debt obligations	2,271.7	2,071.6
Loans payable of Consolidated Funds	5,905.2	5,890.0
Accounts payable, accrued expenses and other liabilities	369.2	379.7
Accrued compensation and benefits	4,320.9	4,955.0
Due to affiliates	362.5	388.1
Deferred revenue	126.4	120.8
Deferred tax liabilities	402.7	487.1
Other liabilities of Consolidated Funds	279.3	683.9
Lease liabilities	502.9	537.8
Accrued giveback obligations	40.9	30.2
Total liabilities	14,581.7	15,544.2
Common stock	3.6	3.6
Additional paid-in capital	3,138.5	2,717.6
Retained earnings	3,401.1	2,805.3
Accumulated other comprehensive income (loss)	(322.2)	(247.5)
Non-controlling interests in consolidated entities	600.3	427.2
Total equity	6,821.3	5,706.2	2,930.2	$ 2,969.6
Total liabilities and equity	21,403.0	21,250.4
Accrued performance allocations	7,117.7	8,133.0
Consolidated Operating Entities
Assets
Cash and cash equivalents	1,360.7	2,469.5	987.6
Restricted cash	0.8	5.6	$ 2.0
Consolidated Entities | Consolidated Operating Entities
Assets
Cash and cash equivalents	1,360.7	2,469.5
Cash and cash equivalents held at Consolidated Funds	0.0	0.0
Restricted cash	0.8	5.6
Corporate treasury investments	20.0
Accrued performance fees	0.0
Investments, including accrued performance allocations of $7,117.7 and $8,133.0 as of December 31, 2022 and 2021, respectively	10,989.9	11,022.5
Investments of Consolidated Funds	0.0	0.0
Due from affiliates and other receivables, net	960.5	384.9
Due from affiliates and other receivables of Consolidated Funds, net	0.0	0.0
Fixed assets, net	139.9	143.9
Lease right-of-use assets, net	337.0	361.1
Deposits and other	70.4	61.3
Intangible assets, net	897.8	34.9
Deferred tax assets	15.8	14.5
Total assets	14,792.8	14,498.2
Liabilities and equity
Debt obligations	2,271.7	2,071.6
Loans payable of Consolidated Funds	0.0	0.0
Accounts payable, accrued expenses and other liabilities	369.2	379.7
Accrued compensation and benefits	4,320.9	4,955.0
Due to affiliates	346.1	388.1
Deferred revenue	126.4	120.8
Deferred tax liabilities	402.7	487.1
Other liabilities of Consolidated Funds	0.0	0.0
Lease liabilities	502.9	537.8
Accrued giveback obligations	40.9	30.2
Total liabilities	8,380.8	8,970.3
Common stock	3.6	3.6
Additional paid-in capital	3,138.5	2,717.6
Retained earnings	3,401.1	2,805.3
Accumulated other comprehensive income (loss)	(319.5)	(245.7)
Non-controlling interests in consolidated entities	188.3	247.1
Total equity	6,412.0	5,527.9
Total liabilities and equity	14,792.8	14,498.2
Consolidated Entities | Consolidated Funds
Assets
Cash and cash equivalents	0.0	0.0
Cash and cash equivalents held at Consolidated Funds	209.0	147.8
Restricted cash	0.0	0.0
Corporate treasury investments	0.0
Accrued performance fees	0.0
Investments, including accrued performance allocations of $7,117.7 and $8,133.0 as of December 31, 2022 and 2021, respectively	0.0	0.0
Investments of Consolidated Funds	6,894.4	6,661.0
Due from affiliates and other receivables, net	0.0	0.0
Due from affiliates and other receivables of Consolidated Funds, net	101.9	138.8
Fixed assets, net	0.0	0.0
Lease right-of-use assets, net	0.0	0.0
Deposits and other	8.0	0.4
Intangible assets, net	0.0	0.0
Deferred tax assets	0.0	0.0
Total assets	7,213.3	6,948.0
Liabilities and equity
Debt obligations	0.0	0.0
Loans payable of Consolidated Funds	6,279.7	5,890.0
Accounts payable, accrued expenses and other liabilities	0.0	0.0
Accrued compensation and benefits	0.0	0.0
Due to affiliates	16.5	0.0
Deferred revenue	0.0	0.0
Deferred tax liabilities	0.0	0.0
Other liabilities of Consolidated Funds	279.7	684.0
Lease liabilities	0.0	0.0
Accrued giveback obligations	0.0	0.0
Total liabilities	6,575.9	6,574.0
Common stock	0.0	0.0
Additional paid-in capital	238.7	198.6
Retained earnings	0.0	0.0
Accumulated other comprehensive income (loss)	(13.3)	(4.7)
Non-controlling interests in consolidated entities	412.0	180.1
Total equity	637.4	374.0
Total liabilities and equity	7,213.3	6,948.0
Eliminations
Assets
Cash and cash equivalents	0.0	0.0
Cash and cash equivalents held at Consolidated Funds	0.0	0.0
Restricted cash	0.0	0.0
Corporate treasury investments	0.0
Accrued performance fees	0.0
Investments, including accrued performance allocations of $7,117.7 and $8,133.0 as of December 31, 2022 and 2021, respectively	(222.0)	(190.5)
Investments of Consolidated Funds	0.0	0.0
Due from affiliates and other receivables, net	(381.1)	(5.3)
Due from affiliates and other receivables of Consolidated Funds, net	0.0	0.0
Fixed assets, net	0.0	0.0
Lease right-of-use assets, net	0.0	0.0
Deposits and other	0.0	0.0
Intangible assets, net	0.0	0.0
Deferred tax assets	0.0	0.0
Total assets	(603.1)	(195.8)
Liabilities and equity
Debt obligations	0.0	0.0
Loans payable of Consolidated Funds	(374.5)	0.0
Accounts payable, accrued expenses and other liabilities	0.0	0.0
Accrued compensation and benefits	0.0	0.0
Due to affiliates	(0.1)	0.0
Deferred revenue	0.0	0.0
Deferred tax liabilities	0.0	0.0
Other liabilities of Consolidated Funds	(0.4)	(0.1)
Lease liabilities	0.0	0.0
Accrued giveback obligations	0.0	0.0
Total liabilities	(375.0)	(0.1)
Common stock	0.0	0.0
Additional paid-in capital	(238.7)	(198.6)
Retained earnings	0.0	0.0
Accumulated other comprehensive income (loss)	10.6	2.9
Non-controlling interests in consolidated entities	0.0	0.0
Total equity	(228.1)	(195.7)
Total liabilities and equity	$ (603.1)	$ (195.8)