Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income/(loss)	$ (168.2)	$ 925.5	$ 1,969.4
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Amortization and depreciation	182.8	195.3	205.3
Impairment of intangible assets	1,248.9	0.0	0.0
Common share-based compensation expense	114.6	106.2	140.1
Other (gains)/losses, net	(97.3)	139.5	(120.5)
Other (gains)/losses of CIP, net	176.3	126.9	(390.0)
Equity in earnings of unconsolidated affiliates	(71.3)	(106.1)	(152.3)
Distributions from equity method investees	69.4	74.2	48.2
Changes in operating assets and liabilities:
(Purchase)/sale of investments by CIP, net	(50.8)	(359.2)	(421.6)
(Purchase)/sale of investments, net	69.4	(27.6)	93.8
(Increase)/decrease in receivables	448.7	912.8	5,581.2
Increase/(decrease) in payables	(621.7)	(1,284.3)	(5,875.5)
Net cash provided by/(used in) operating activities	1,300.8	703.2	1,078.1
Investing activities:
Purchase of property, equipment and software	(164.3)	(192.9)	(108.8)
Purchase of investments by CIP	(3,214.4)	(2,717.2)	(5,981.8)
Sale of investments by CIP	3,111.6	2,638.4	5,281.5
Purchase of investments	(65.2)	(217.8)	(191.1)
Sale of investments	26.8	97.9	129.2
Capital distribution from equity method investees	23.3	32.6	44.9
Other investing activities	46.2	0.0	0.0
Net cash inflows/(outflows) upon consolidation/deconsolidation of CIP	(8.3)	(16.6)	(21.8)
Net cash provided by/(used in) investing activities	(244.3)	(375.6)	(847.9)
Financing activities:
Purchases of treasury shares	(187.5)	(244.7)	(60.9)
Dividends paid - preferred	(236.8)	(236.8)	(236.8)
Dividends paid - common	(357.9)	(334.8)	(307.7)
Third-party capital invested into CIP	201.2	709.2	628.9
Third-party capital distributed by CIP	(255.6)	(284.8)	(395.5)
Borrowings of debt of CIP	703.0	30.1	3,411.9
Repayments of debt of CIP	(451.8)	(5.1)	(2,497.3)
Repayment of senior notes	0.0	(600.0)	0.0
Settlement of forward contracts on treasury shares	0.0	0.0	(309.4)
Collateral received/(returned), net	0.0	0.0	(104.1)
Payment of contingent consideration	0.0	0.0	(11.8)
Net cash provided by/(used in) financing activities	(585.4)	(966.9)	117.3
Increase/(decrease) in cash and cash equivalents	471.1	(639.3)	347.5
Foreign exchange movement on cash and cash equivalents	24.0	(68.6)	(32.2)
Cash and cash equivalents, beginning of period	1,434.1	2,147.1	1,839.3
Cash and cash equivalents, end of period	1,931.6	1,434.1	2,147.1
Cash and cash equivalents	1,469.2	1,234.7	1,896.4
Cash and cash equivalents of CIP	462.4	199.4	250.7
Total cash and cash equivalents per consolidated statement of cash flows	1,931.6	1,434.1	2,147.1
Supplemental Cash Flow Information:
Interest paid	(68.2)	(67.4)	(85.7)
Interest received	31.0	8.7	0.7
Taxes paid	(195.1)	(301.4)	(431.7)
Consolidated VIEs
Financing activities:
Foreign exchange movement on cash and cash equivalents	$ 2.4	$ (5.1)	$ (7.5)