Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Total stockholders’ equity (deficit)	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
Repurchases of common stock including excise taxes (in shares)	0
Equity-based compensation				0.7		0.7
Foreign currency translation adjustment, net of tax	$ 1.5			1.5				1.5
Amortization related to derivatives securities, net of tax				1.2				1.2
Withholding tax related to stock option exercise and restricted stock vesting	(0.7)			(0.7)		(0.7)
Dividends				(0.8)			(0.8)
Net income				23.4			23.4		$ 0.1
Ending balance (in shares) at Jun. 30, 2023					41,500,000
Ending balance at Jun. 30, 2023			(7.9)	3.7	$ 0.0	1.5	10.1	(7.9)
Beginning balance at Dec. 31, 2022									0.0
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital Contributions (Redemptions) In Permanent And Temporary Equities	(2.2)								(2.2)
Net income				23.4			23.4		0.1
Ending balance at Jun. 30, 2023									2.3
Beginning balance at Dec. 31, 2022	(21.6)
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions	2.2								2.2
Equity-based compensation	0.7
Foreign currency translation adjustment, net of tax	1.5
Amortization related to derivative securities, net of tax	1.2
Withholding tax related to stock option exercise and restricted stock vesting	(0.7)			(0.7)		(0.7)
Dividends	(0.8)
Net income	23.5
Ending balance at Jun. 30, 2023	6.0
Beginning balance (in shares) at Mar. 31, 2023					41,500,000
Beginning balance at Mar. 31, 2023			(9.3)	(8.7)	$ 0.0	1.4	(0.8)	(9.3)
Increase (Decrease) in Stockholders' Equity
Equity-based compensation				0.5		0.5
Foreign currency translation adjustment, net of tax	0.8			0.8				0.8
Amortization related to derivatives securities, net of tax				0.6				0.6
Withholding tax related to stock option exercise and restricted stock vesting		$ (0.4)		(0.4)		(0.4)
Dividends				(0.5)			(0.5)
Net income				11.4			11.4		0.1
Ending balance (in shares) at Jun. 30, 2023					41,500,000
Ending balance at Jun. 30, 2023			(7.9)	3.7	$ 0.0	1.5	10.1	(7.9)
Beginning balance at Mar. 31, 2023									0.4
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital Contributions (Redemptions) In Permanent And Temporary Equities	(1.8)								(1.8)
Net income				11.4			11.4		0.1
Ending balance at Jun. 30, 2023									2.3
Beginning balance at Mar. 31, 2023	(8.3)
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions	1.8								1.8
Equity-based compensation	0.5
Foreign currency translation adjustment, net of tax	0.8
Amortization related to derivative securities, net of tax	0.6
Withholding tax related to stock option exercise and restricted stock vesting		$ (0.4)		(0.4)		(0.4)
Dividends	(0.5)
Net income	11.5
Ending balance at Jun. 30, 2023	$ 6.0
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)					100,000
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				0.4		0.4
Foreign currency translation adjustment, net of tax	0.0
Amortization related to derivatives securities, net of tax				1.3				1.3
Withholding tax related to stock option exercise and restricted stock vesting	(1.8)			(1.8)			(1.8)
Dividends				(0.8)			(0.8)
Net income				25.6			25.6		1.6
Ending balance (in shares) at Jun. 30, 2024					37,100,000
Ending balance at Jun. 30, 2024			(5.4)	(30.8)	$ 0.0	0.0	(25.4)	(5.4)
Beginning balance at Dec. 31, 2023									9.3
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital Contributions (Redemptions) In Permanent And Temporary Equities	(1.1)								(1.1)
Net income				25.6			25.6		1.6
Ending balance at Jun. 30, 2024									12.0
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	0.4
Amortization related to derivative securities, net of tax	1.3
Withholding tax related to stock option exercise and restricted stock vesting	(1.8)			(1.8)			(1.8)
Dividends	(0.8)
Net income	27.2
Ending balance at Jun. 30, 2024	(18.8)
Beginning balance (in shares) at Mar. 31, 2024					38,000,000.0
Beginning balance at Mar. 31, 2024			(6.2)	(21.7)	$ 0.0	0.0	(15.5)	(6.2)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)					0
Repurchases of common stock including excise taxes (in shares)					(900,000)
Repurchases of common stock including excise taxes				(20.7)		(0.2)	(20.5)
Equity-based compensation				0.2		0.2
Foreign currency translation adjustment, net of tax	0.2			0.2				0.2
Amortization related to derivatives securities, net of tax				0.6				0.6
Dividends				(0.4)			(0.4)
Net income				11.0			11.0		0.5
Ending balance (in shares) at Jun. 30, 2024					37,100,000
Ending balance at Jun. 30, 2024			$ (5.4)	(30.8)	$ 0.0	$ 0.0	(25.4)	$ (5.4)
Beginning balance at Mar. 31, 2024									11.5
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Net income				$ 11.0			$ 11.0		0.5
Ending balance at Jun. 30, 2024									$ 12.0
Beginning balance at Mar. 31, 2024	(10.2)
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Repurchases of common stock including excise taxes	(20.7)
Equity-based compensation	0.2
Foreign currency translation adjustment, net of tax	0.2
Amortization related to derivative securities, net of tax	0.6
Dividends	(0.4)
Net income	11.5
Ending balance at Jun. 30, 2024	$ (18.8)