Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Accumulated other comprehensive income (loss)	Consolidated Entity Excluding Consolidated Funds Total stockholders’ equity (deficit)	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 Funds
Beginning balance (in shares) at Dec. 31, 2022				41,400,000
Beginning balance at Dec. 31, 2022		$ (10.6)	$ (21.6)	$ 0.0	$ 1.5	$ (12.5)	$ (10.6)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				100,000
Equity-based compensation			1.0		1.0
Foreign currency translation adjustment, net of tax	$ 0.6		0.6				0.6
Amortization related to derivatives securities, net of tax			1.9				1.9
Withholding tax related to stock option exercise and restricted stock vesting	(0.7)		(0.7)		(0.7)
Dividends			(1.3)			(1.3)
Net income			43.0			43.0		$ 0.3
Ending balance (in shares) at Sep. 30, 2023				41,500,000
Ending balance at Sep. 30, 2023		(8.1)	22.9	$ 0.0	1.8	29.2	(8.1)
Beginning balance at Dec. 31, 2022								0.0
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions	9.9							9.9
Net de-consolidation of Funds								(1.9)
Net income			43.0			43.0		0.3
Ending balance at Sep. 30, 2023								8.3
Beginning balance at Dec. 31, 2022	(21.6)
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions	9.9							9.9
Equity-based compensation	1.0
Foreign currency translation adjustment, net of tax	0.6
Amortization related to derivative securities, net of tax	1.9
Net de-consolidation of Funds	(1.9)
Withholding tax related to stock option exercise and restricted stock vesting	(0.7)		(0.7)		(0.7)
Dividends	(1.3)
Net income	43.3
Ending balance at Sep. 30, 2023	31.2
Beginning balance (in shares) at Jun. 30, 2023				41,500,000
Beginning balance at Jun. 30, 2023		(7.9)	3.7	$ 0.0	1.5	10.1	(7.9)
Increase (Decrease) in Stockholders' Equity
Equity-based compensation			0.3		0.3
Foreign currency translation adjustment, net of tax	(0.9)		(0.9)				(0.9)
Amortization related to derivatives securities, net of tax			0.7				0.7
Dividends			(0.5)			(0.5)
Net income			19.6			19.6		0.2
Ending balance (in shares) at Sep. 30, 2023				41,500,000
Ending balance at Sep. 30, 2023		(8.1)	22.9	$ 0.0	1.8	29.2	(8.1)
Beginning balance at Jun. 30, 2023								2.3
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions	7.7							7.7
Net de-consolidation of Funds								(1.9)
Net income			19.6			19.6		0.2
Ending balance at Sep. 30, 2023								8.3
Beginning balance at Jun. 30, 2023	6.0
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions	7.7							7.7
Equity-based compensation	0.3
Foreign currency translation adjustment, net of tax	(0.9)
Amortization related to derivative securities, net of tax	0.7
Net de-consolidation of Funds	(1.9)
Dividends	(0.5)
Net income	19.8
Ending balance at Sep. 30, 2023	31.2
Beginning balance (in shares) at Dec. 31, 2023				41,400,000
Beginning balance at Dec. 31, 2023		(6.7)	40.2	$ 0.0	0.0	46.9	(6.7)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				300,000
Issuance of common stock	$ 0.1		0.1		0.1
Repurchases of common stock including excise taxes (in shares)	(4,445,534)			(4,400,000)
Repurchases of common stock including excise taxes	$ (94.9)		(95.7)		(0.4)	(95.3)
Equity-based compensation			0.6		0.6
Foreign currency translation adjustment, net of tax	0.8		0.8				0.8
Amortization related to derivatives securities, net of tax			2.0				2.0
Withholding tax related to stock option exercise and restricted stock vesting	(7.2)		(7.2)		(0.3)	(6.9)
Dividends			(1.2)			(1.2)
Net income			42.5			42.5		3.7
Ending balance (in shares) at Sep. 30, 2024				37,300,000
Ending balance at Sep. 30, 2024		(3.9)	(17.9)	$ 0.0	0.0	(14.0)	(3.9)
Beginning balance at Dec. 31, 2023								9.3
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions	1.1							1.1
Net income			42.5			42.5		3.7
Ending balance at Sep. 30, 2024								14.1
Beginning balance at Dec. 31, 2023	49.5
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Repurchases of common stock including excise taxes	(95.7)
Capital contributions	1.1							1.1
Equity-based compensation	0.6
Foreign currency translation adjustment, net of tax	0.8
Amortization related to derivative securities, net of tax	2.0
Withholding tax related to stock option exercise and restricted stock vesting	(7.2)		(7.2)		(0.3)	(6.9)
Dividends	(1.2)
Net income	46.2
Ending balance at Sep. 30, 2024	(3.8)
Beginning balance (in shares) at Jun. 30, 2024				37,100,000
Beginning balance at Jun. 30, 2024		(5.4)	(30.8)	$ 0.0	0.0	(25.4)	(5.4)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				200,000
Issuance of common stock	0.1		0.1		0.1
Equity-based compensation			0.2		0.2
Foreign currency translation adjustment, net of tax	0.8		0.8				0.8
Amortization related to derivatives securities, net of tax			0.7				0.7
Withholding tax related to stock option exercise and restricted stock vesting	(5.4)		(5.4)		(0.3)	(5.1)
Dividends			(0.4)			(0.4)
Net income			16.9			16.9		2.1
Ending balance (in shares) at Sep. 30, 2024				37,300,000
Ending balance at Sep. 30, 2024		$ (3.9)	(17.9)	$ 0.0	0.0	(14.0)	$ (3.9)
Beginning balance at Jun. 30, 2024								12.0
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Net income			16.9			16.9		2.1
Ending balance at Sep. 30, 2024								$ 14.1
Beginning balance at Jun. 30, 2024	(18.8)
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Equity-based compensation	0.2
Foreign currency translation adjustment, net of tax	0.8
Amortization related to derivative securities, net of tax	0.7
Withholding tax related to stock option exercise and restricted stock vesting	(5.4)		$ (5.4)		$ (0.3)	$ (5.1)
Dividends	(0.4)
Net income	19.0
Ending balance at Sep. 30, 2024	$ (3.8)