Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Accumulated other comprehensive income (loss)	Consolidated Entity Excluding Consolidated Funds Total stockholders’ equity	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, 2021				45,400,000
Beginning balance at Dec. 31, 2021		$ (10.8)	$ (17.6)	$ 0.0	$ 0.0	$ (6.8)	$ (10.8)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				200,000
Repurchase of common stock (in shares)	(4,147,450)			(4,200,000)
Repurchase of common stock including excise taxes	$ (100.0)		(103.2)			(103.2)
Equity-based compensation			2.4		2.4
Foreign currency translation adjustment, net of tax	(3.1)		(3.1)				(3.1)
Amortization related to derivative securities, net of tax			3.3				3.3
Withholding tax related to stock option exercise and restricted stock vesting	(2.3)		(2.3)		(0.9)	(1.4)
Dividends			(1.7)			(1.7)
Net income			100.6			100.6
Ending balance (in shares) at Dec. 31, 2022				41,400,000
Ending balance at Dec. 31, 2022		(10.6)	(21.6)	$ 0.0	1.5	(12.5)	(10.6)
Beginning balance at Dec. 31, 2021								$ 0.0
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Net income	100.6
Ending balance at Dec. 31, 2022								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	2.4
Foreign currency translation adjustment, net of tax	(3.1)
Amortization related to derivative securities, net of tax	3.3
Withholding tax related to stock option exercise and restricted stock vesting	(2.3)		(2.3)		(0.9)	(1.4)
Dividends	(1.7)
Net income	100.6
Ending balance at Dec. 31, 2022	$ (21.6)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				300,000
Repurchase of common stock (in shares)	(268,800)			(300,000)
Repurchase of common stock including excise taxes	$ (5.1)		(5.1)		(0.3)	(4.8)
Equity-based compensation			1.2		1.2
Foreign currency translation adjustment, net of tax	1.4		1.4				1.4
Amortization related to derivative securities, net of tax			2.5				2.5
Withholding tax related to stock option exercise and restricted stock vesting	(2.4)		(2.4)		(2.4)
De-consolidation of Funds	(1.9)
Dividends			(1.6)			(1.6)
Net income			65.8			65.8
Ending balance (in shares) at Dec. 31, 2023				41,400,000
Ending balance at Dec. 31, 2023		(6.7)	40.2	$ 0.0	0.0	46.9	(6.7)
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions	9.9							9.9
De-consolidation of Funds								(1.9)
Net income	67.1							1.3
Ending balance at Dec. 31, 2023								9.3
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Repurchase of common stock	(5.1)
Capital contributions	9.9							9.9
Equity-based compensation	1.2
Foreign currency translation adjustment, net of tax	1.4
Amortization related to derivative securities, net of tax	2.5
Withholding tax related to stock option exercise and restricted stock vesting	(2.4)		(2.4)		(2.4)
Dividends	(1.6)
Net income	67.1							1.3
Ending balance at Dec. 31, 2023	$ 49.5
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				500,000
Issuance of common stock			0.1		0.1
Repurchase of common stock (in shares)	(4,445,534)			(4,400,000)
Repurchase of common stock including excise taxes	$ (94.9)		(95.6)		(0.4)	(95.2)
Equity-based compensation			0.9		0.9
Foreign currency translation adjustment, net of tax	(0.4)		(0.4)				(0.4)
Amortization related to derivative securities, net of tax			2.7				2.7
Withholding tax related to stock option exercise and restricted stock vesting	(11.4)		(11.4)		(0.6)	(10.8)
Dividends			(1.5)			(1.5)
Net income			85.0			85.0
Ending balance (in shares) at Dec. 31, 2024				37,500,000
Ending balance at Dec. 31, 2024		$ (4.4)	20.0	$ 0.0	0.0	24.4	$ (4.4)
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions	56.0							56.0
Net income	86.8							1.8
Ending balance at Dec. 31, 2024								67.1
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Issuance of common stock	0.1
Repurchase of common stock	(95.6)
Capital contributions	56.0							56.0
Equity-based compensation	0.9
Foreign currency translation adjustment, net of tax	(0.4)
Amortization related to derivative securities, net of tax	2.7
Withholding tax related to stock option exercise and restricted stock vesting	(11.4)		$ (11.4)		$ (0.6)	$ (10.8)
Dividends	(1.5)
Net income	86.8							$ 1.8
Ending balance at Dec. 31, 2024	$ 87.1