Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	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 Entity Excluding Consolidated Funds	Non- controlling interests Consolidated Funds
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
Capital contributions	3.8						3.8
Equity-based compensation	0.4		0.4			0.4
Foreign currency translation adjustment	1.1				1.1	1.1
Amortization related to derivatives securities, net of tax	0.6				0.6	0.6
Other changes in non-controlling interests	0.1						0.1
Dividends	(0.8)			(0.8)		(0.8)
Net income	40.4			27.0		27.0		13.4
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 at Dec. 31, 2020	384.4
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions	3.8
Equity-based compensation	0.4
Foreign currency translation adjustment	1.1
Amortization related to derivative securities, net of tax	0.6
Other changes in non-controlling interests	0.1						0.1
Dividends	(0.8)
Net income	40.4
Ending balance at Mar. 31, 2021	430.0
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
Issuance of common stock	0.0
Repurchase of common stock (in shares)		(4.2)
Repurchase of common stock	(103.2)			(103.2)		(103.2)
Equity-based compensation	0.9		0.9			0.9
Foreign currency translation adjustment	(0.7)				(0.7)	(0.7)
Amortization related to derivatives securities, net of tax	1.6				1.6	1.6
Withholding tax related to stock option exercise	(2.3)		(0.9)	(1.4)		(2.3)
Dividends	(0.4)			(0.4)		(0.4)
Net income	23.8			23.8		23.8
Ending balance (in shares) at Mar. 31, 2022		41.4
Ending balance at Mar. 31, 2022	(97.9)	$ 0.0	$ 0.0	$ (88.0)	$ (9.9)	$ (97.9)	$ 0.0	$ 0.0
Beginning balance at Dec. 31, 2021	(17.6)
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Repurchase of common stock	(103.2)
Equity-based compensation	0.9
Foreign currency translation adjustment	(0.7)
Amortization related to derivative securities, net of tax	1.6
Dividends	(0.4)
Net income	23.8
Ending balance at Mar. 31, 2022	$ (97.9)