Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 23.5	$ 52.4
Less: Net (income) loss attributable to redeemable non-controlling interests in consolidated Funds	(0.1)	0.0
Adjustments to reconcile net income to net cash flows from operating activities:
Loss on extinguishment of debt	0.0	3.2
Depreciation and other amortization	8.2	10.6
Amortization of debt-related costs	2.0	3.6
Amortization and revaluation of non-cash compensation awards	2.0	(20.5)
Deferred income taxes	(3.0)	7.0
(Gains) losses on other investments	(2.3)	3.6
Changes in operating assets and liabilities:
Decrease in investment advisory fees receivable	32.7	68.2
(Increase) decrease in other receivables, prepayments, deposits and other assets	2.1	(1.7)
Decrease in accrued incentive compensation, operating lease liabilities and other liabilities	(46.3)	(77.3)
Decrease in accounts payable, accrued expenses and accrued income taxes	(11.5)	(19.2)
Adjustments to reconcile net income (loss) attributable to redeemable non-controlling interests of consolidated Funds to net cash flows from operating activities of consolidated Funds:
Total net cash flows from operating activities	4.4	29.9
Cash flows from investing activities:
Additions of fixed assets	(7.9)	(8.2)
Purchase of investment securities	(8.2)	(5.1)
Sale of investment securities	5.4	6.9
Net cash flows from investing activities	(10.7)	(6.4)
Cash flows from financing activities:
Proceeds from revolving credit facility	100.0	175.0
Repayment of third party borrowings and revolving credit facility	(62.0)	(250.0)
Payment for debt issuance costs	0.0	(0.9)
Payment to OM plc for co-investment redemptions	(0.4)	(1.1)
Dividends paid to stockholders	(0.8)	(0.6)
Dividends paid to related parties	(0.4)	(0.3)
Repurchases of common stock	0.0	(103.2)
Withholding tax payments related to stock option exercise and restricted stock vesting	(0.7)	(2.3)
Cash flows from financing activities of consolidated Funds:
Net cash flows from financing activities	37.9	(183.4)
Effect of foreign exchange rate changes on cash and cash equivalents	0.1	0.0
Net increase (decrease) in cash and cash equivalents	31.7	(159.9)
Cash and cash equivalents at beginning of period	121.2	252.1
Cash and cash equivalents at end of period (including cash at consolidated Funds classified as restricted)	152.9	92.2
Supplemental disclosure of cash flow information:
Income taxes paid	20.9	27.7
Consolidated Entity Excluding Consolidated Funds
Adjustments to reconcile net income (loss) attributable to redeemable non-controlling interests of consolidated Funds to net cash flows from operating activities of consolidated Funds:
Total net cash flows from operating activities	7.3	29.9
Supplemental disclosure of cash flow information:
Interest paid (excluding consolidated Funds)	8.2	8.7
Consolidated Funds
Adjustments to reconcile net income (loss) attributable to redeemable non-controlling interests of consolidated Funds to net cash flows from operating activities of consolidated Funds:
Purchase of investments	(2.2)	0.0
Sale of investments	2.4	0.0
(Increase) decrease in receivables and other assets	(27.8)	0.0
Increase in accounts payable and other liabilities	24.6	0.0
Total net cash flows from operating activities	(2.9)	0.0
Cash flows from financing activities of consolidated Funds:
Redeemable non-controlling interest capital raised	$ 2.2	$ 0.0