Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Retained earnings (deficit)	Total stockholders’ equity	Non- controlling interests	Consolidated Entity Excluding Consolidated Funds Common Stock	Consolidated Entity Excluding Consolidated Funds Additional paid-in capital	Consolidated Entity Excluding Consolidated Funds Retained earnings (deficit)	Consolidated Entity Excluding Consolidated Funds Accumulated other comprehensive income (loss)	Consolidated Entity Excluding Consolidated Funds Total stockholders’ equity	Consolidated Entity Excluding Consolidated Funds Non- controlling interests	Consolidated Funds Non- controlling interests
Beginning balance (in shares) at Dec. 31, 2020					79.4
Beginning balance at Dec. 31, 2020	$ 384.4				$ 0.1	$ 492.4	$ (176.5)	$ (13.6)	$ 302.4	$ 1.7	$ 80.3
Increase (Decrease) in Stockholders' Equity
Net de-consolidation of Funds	(178.0)
Ending balance (in shares) at Mar. 31, 2021					79.4
Ending balance at Mar. 31, 2021	430.0				$ 0.1	492.8	(150.3)	(11.9)	330.7	5.6	93.7
Beginning balance (in shares) at Dec. 31, 2020					79.4
Beginning balance at Dec. 31, 2020	384.4				$ 0.1	492.4	(176.5)	(13.6)	302.4	1.7	80.3
Increase (Decrease) in Stockholders' Equity
Issuance of common stock	0.1					0.1			0.1
Capital contributions	33.5									3.8	29.7
Equity-based compensation	0.9					0.9			0.9
Foreign currency translation adjustment	1.2							1.2	1.2
Amortization related to derivatives securities, net of tax	1.2							1.2	1.2
Other changes in non-controlling interests	(5.5)									(5.5)
Net de-consolidation of Funds											(178.0)
Dividends	(1.6)						(1.6)		(1.6)
Net income	627.7						559.7		559.7		68.0
Ending balance (in shares) at Jun. 30, 2021					79.4
Ending balance at Jun. 30, 2021	863.9				$ 0.1	493.4	381.6	(11.2)	863.9	0.0	0.0
Beginning balance (in shares) at Mar. 31, 2021					79.4
Beginning balance at Mar. 31, 2021	430.0				$ 0.1	492.8	(150.3)	(11.9)	330.7	5.6	93.7
Increase (Decrease) in Stockholders' Equity
Issuance of common stock	0.1					0.1			0.1
Capital contributions	29.7										29.7
Equity-based compensation	0.5					0.5			0.5
Foreign currency translation adjustment	0.1							0.1	0.1
Amortization related to derivatives securities, net of tax	0.6							0.6	0.6
Other changes in non-controlling interests	(5.6)									(5.6)
Net de-consolidation of Funds	(178.0)			$ (178.0)
Dividends	(0.8)	$ (0.8)	$ (0.8)
Net income	587.3						532.7		532.7		54.6
Ending balance (in shares) at Jun. 30, 2021					79.4
Ending balance at Jun. 30, 2021	863.9				$ 0.1	493.4	381.6	(11.2)	863.9	0.0	0.0
Beginning balance (in shares) at Dec. 31, 2021					45.4
Beginning balance at Dec. 31, 2021	(17.6)				$ 0.0	0.0	(6.8)	(10.8)	(17.6)	0.0	0.0
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)					0.2
Repurchase of common stock (in shares)					(4.2)
Repurchase of common stock	(103.2)						(103.2)		(103.2)
Equity-based compensation	1.4					1.4			1.4
Foreign currency translation adjustment	(3.1)							(3.1)	(3.1)
Amortization related to derivatives securities, net of tax	2.2							2.2	2.2
Withholding tax related to stock option exercise	(2.3)					(0.9)	(1.4)		(2.3)
Dividends	(0.8)						(0.8)		(0.8)
Net income	52.4						52.4		52.4
Ending balance (in shares) at Jun. 30, 2022					41.4
Ending balance at Jun. 30, 2022	(71.0)				$ 0.0	0.5	(59.8)	(11.7)	(71.0)	0.0	0.0
Beginning balance (in shares) at Mar. 31, 2022					41.4
Beginning balance at Mar. 31, 2022	(97.9)				$ 0.0	0.0	(88.0)	(9.9)	(97.9)	0.0	0.0
Increase (Decrease) in Stockholders' Equity
Equity-based compensation	0.5					0.5			0.5
Foreign currency translation adjustment	(2.4)							(2.4)	(2.4)
Amortization related to derivatives securities, net of tax	0.6							0.6	0.6
Dividends	(0.4)						(0.4)		(0.4)
Net income	28.6						28.6		28.6
Ending balance (in shares) at Jun. 30, 2022					41.4
Ending balance at Jun. 30, 2022	$ (71.0)				$ 0.0	$ 0.5	$ (59.8)	$ (11.7)	$ (71.0)	$ 0.0	$ 0.0