Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities:
Net income	$ 464.7	$ 410.1
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Amortization and depreciation	81.6	91.5
Common share-based compensation expense	38.9	39.5
Other (gains)/losses, net	(33.1)	(38.9)
Other (gains)/losses of CIP, net	(10.8)	12.0
Equity in earnings of unconsolidated affiliates	(44.6)	(20.8)
Distributions from equity method investees	1.5	28.2
Changes in operating assets and liabilities:
(Purchase)/sale of investments by CIP, net	39.4	47.6
(Purchase)/sale of investments, net	84.5	(1.7)
(Increase)/decrease in receivables and other assets	(26.1)	397.7
Increase/(decrease) in payables and other liabilities	(132.7)	(530.5)
Net cash provided by/(used in) operating activities	463.3	434.7
Investing activities:
Purchase of property, equipment and software	(40.9)	(47.7)
Purchase of investments by CIP	(1,914.1)	(1,661.4)
Sale of investments by CIP	1,537.0	1,725.8
Purchase of investments	(23.9)	(39.3)
Sale of investments	0.1	0.1
Capital distribution from equity method investees	74.4	121.2
Net cash inflows/(outflows) upon consolidation/deconsolidation of CIP	0.0	(41.3)
Net cash provided by/(used in) investing activities	(367.4)	57.4
Financing activities:
Purchases of treasury shares	(68.6)	(23.1)
Repurchase of preferred shares	(1,150.0)	0.0
Dividends paid - preferred	(115.8)	(118.4)
Dividends paid - common	(187.7)	(183.4)
Third-party capital invested into CIP	107.3	105.7
Third-party capital distributed by CIP	(133.4)	(108.5)
Borrowings of debt of CIP	2,054.0	307.7
Repayments of debt of CIP	(1,694.0)	(240.0)
Borrowings of Revolving credit agreement	1,684.5	1,436.3
Repayments of Revolving credit agreement	(1,684.5)	(1,436.3)
Net proceeds from bank term loans	992.7	0.0
Repayment of senior notes	0.0	(600.0)
Net cash provided by/(used in) financing activities	(195.5)	(860.0)
Increase/(decrease) in cash and cash equivalents	(99.6)	(367.9)
Supplemental Cash Flow Information [Abstract]
Foreign exchange movement on cash and cash equivalents	59.4	(19.3)
Foreign exchange movement on cash and cash equivalents of CIP	36.1	(3.1)
Cash and cash equivalents, beginning of period	1,496.0	1,931.6
Cash and cash equivalents, end of period	1,491.9	1,541.3
Cash and cash equivalents	922.7	878.5
Cash and cash equivalents of CIP	569.2	662.8
Total cash and cash equivalents per condensed consolidated statement of cash flows	$ 1,491.9	$ 1,541.3