CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income before non-controlling interests	$ 334	$ 293
Adjustments to reconcile net income before non-controlling interests to net cash provided by operating activities:
Amortization	53	43
Depreciation	11	11
Non-cash stock-based compensation	29	29
Change in estimated acquisition earn-out payables	(4)	(2)
Deferred income taxes	(10)	(1)
Net gain on sales/disposals of investments, businesses, fixed assets and customer accounts	2	2
Payments on acquisition earn-outs in excess of original estimated payables		(13)
Other	2
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Commissions, fees and other receivables (increase) decrease	(180)	(142)
Reinsurance recoverable (increase) decrease	1,080	60
Prepaid reinsurance premiums (increase) decrease	40	33
Other assets (increase) decrease	35
Losses and loss adjustment reserve increase (decrease)	(1,081)	(59)
Unearned premiums increase (decrease)	(35)	25
Accounts payable increase (decrease)	126	(86)
Accrued expenses and other liabilities increase (decrease)	(195)	(186)
Other liabilities increase (decrease)	6	6
Net cash provided by operating activities	213	13
Cash flows from investing activities:
Additions to fixed assets	(17)	(13)
Payments for businesses acquired, net of cash acquired	(67)	(76)
Proceeds from sales of businesses, fixed assets and customer accounts	9
Other investing activities	(4)	1
Net cash used in investing activities	(79)	(88)
Cash flows from financing activities:
Fiduciary receivables and liabilities, net	(90)	(26)
Payments on acquisition earn-outs	(26)	(39)
Payments on long-term debt	(169)	(13)
Borrowings on revolving credit facility	150	150
Payments on revolving credit facility		(50)
Repurchase shares to fund tax withholdings for non-cash stock-based compensation	(40)	(54)
Cash dividends paid	(43)	(38)
Other financing activities		3
Net cash used in financing activities	(218)	(67)
Effect of foreign exchange rate changes on cash and cash equivalents inclusive of fiduciary cash	22	(11)
Net decrease in cash and cash equivalents inclusive of fiduciary cash	(62)	(153)
Cash and cash equivalents inclusive of fiduciary cash at beginning of period	2,502	2,303
Cash and cash equivalents inclusive of fiduciary cash at end of period	$ 2,440	$ 2,150