Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 22.1	$ 61.1
Less: Net (income) loss attributable to non-controlling interests in consolidated Funds	10.5	(8.4)
Adjustments to reconcile net income to net cash flows from operating activities from continuing operations:
Loss from discontinued operations, excluding consolidated Funds	0.0	0.0
Impairment of goodwill	16.4	0.0
Amortization of acquired intangibles	1.6
Changes in operating assets and liabilities (excluding discontinued operations):
Net cash flows from operating activities of continuing operations	(33.5)	(292.5)
Net cash flows from operating activities of discontinued operations	0.0	0.0
Total net cash flows from operating activities	(33.5)	(292.5)
Cash flows from investing activities:
Net cash flows from investing activities of continuing operations	1.3	(4.4)
Net cash flows from investing activities of discontinued operations	0.0	0.0
Total net cash flows from investing activities	1.3	(4.4)
Cash flows from financing activities:
Net cash flows from financing activities of continuing operations	42.4	36.5
Net cash flows from financing activities of discontinued operations	0.0	0.0
Total net cash flows from financing activities	42.4	36.5
Effect of foreign exchange rate changes on cash and cash equivalents	0.0	0.0
Net increase (decrease) in cash and cash equivalents	10.2	(260.4)
Cash and cash equivalents at beginning of period	121.0	345.5
Cash and cash equivalents at end of period (including cash at consolidated Funds classified as restricted)	131.2	85.1
Supplemental disclosure of cash flow information:
Interest paid (excluding consolidated Funds)	10.1	9.4
Income taxes paid	0.0	12.9
Investments in unconsolidated Funds
Adjustments to reconcile net income to net cash flows from operating activities from continuing operations:
Loss from discontinued operations, excluding consolidated Funds	0.0	0.0
Impairment of goodwill	16.4	0.0
Amortization of acquired intangibles	1.6	1.6
Depreciation and other amortization	5.3	3.8
Amortization of debt-related costs	1.1	0.9
Amortization and revaluation of non-cash compensation awards	(44.0)	(12.7)
Net earnings from Affiliate accounted for using the equity method	(0.6)	(0.6)
Distributions received from equity method Affiliate	0.2	0.0
Deferred income taxes	22.8	6.2
(Gains) losses on other investments	23.1	(18.3)
Changes in operating assets and liabilities (excluding discontinued operations):
Decrease in investment advisory fees receivable	17.1	7.7
Increase in other receivables, prepayments, deposits and other assets	(18.2)	(6.6)
Decrease in accrued incentive compensation, operating lease liabilities and other liabilities	(70.3)	(316.9)
Decrease in accounts payable, accrued expenses and accrued income taxes	(16.2)	(17.3)
Net cash flows from operating activities of continuing operations	(29.1)	(299.5)
Purchase of investments	(4.8)	(7.0)
Cash flows from investing activities:
Additions of fixed assets	(6.3)	(7.3)
Sale of investments	12.2	9.9
Cash flows from financing activities:
Proceeds from third party and non-recourse borrowings	80.0	240.0
Repayment of third party and non-recourse borrowings	(13.3)	(5.0)
Payment to OM plc for co-investment redemptions	0.0	(5.1)
Dividends paid to shareholders	(5.8)	(6.4)
Dividends paid to related parties	(2.7)	(3.0)
Repurchases of common stock	(17.1)	(183.9)
Consolidated Funds
Cash flows from operating activities:
Less: Net (income) loss attributable to non-controlling interests in consolidated Funds	10.5	(8.4)
Adjustments to reconcile net income to net cash flows from operating activities from continuing operations:
(Gains) losses on other investments	12.0	(2.6)
Changes in operating assets and liabilities (excluding discontinued operations):
Net cash flows from operating activities of continuing operations	(4.4)	7.0
Purchase of investments	(25.1)	(32.7)
Sale of investments	22.0	28.0
Distributions received from equity method investees	0.5	0.0
(Increase) decrease in receivables and other assets	(4.4)	2.3
Increase in accounts payable and other liabilities	1.6	3.6
Cash flows from investing activities:
Contributions in equity method investees	(0.3)	0.0
Cash flows from financing activities:
Non-controlling interest capital redeemed	(0.1)	0.0
Redeemable non-controlling interest capital raised	1.4	0.3
Redeemable non-controlling interest capital redeemed	0.0	(0.4)
Supplemental disclosure of non-cash investing and financing transactions:
Payable for securities purchased by a consolidated Fund	$ 1.1	$ 15.5