CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income before non-controlling interests	$ 791	$ 602
Adjustments to reconcile net income before non-controlling interests to net cash provided by operating activities:
Amortization	131	123
Depreciation	33	30
Non-cash stock-based compensation	77	67
Change in estimated acquisition earn-out payables	(9)	30
Deferred income taxes	(11)	(1)
Amortization of debt discount and disposal of deferred financing costs	3	3
Net gain on sales/disposals of investments, businesses, fixed assets and customer accounts	(29)	(11)
Payments on acquisition earn-outs in excess of original estimated payables	(35)	(18)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Commissions, fees and other receivables (increase) decrease	(119)	(83)
Reinsurance recoverable (increase) decrease	(1,911)	612
Prepaid reinsurance premiums (increase) decrease	(77)	(110)
Other assets (increase) decrease	(81)	(87)
Losses and loss adjustment reserve increase (decrease)	1,913	(609)
Unearned premiums increase (decrease)	163	118
Accounts payable increase (decrease)	(9)	163
Accrued expenses and other liabilities increase (decrease)	(17)	(41)
Other liabilities increase (decrease)		(84)
Net cash provided by operating activities	813	704
Cash flows from investing activities:
Additions to fixed assets	(62)	(38)
Payments for businesses acquired, net of cash acquired	(118)	(163)
Proceeds from sales of businesses, fixed assets and customer accounts	60	8
Purchases of investments	(5)	(6)
Proceeds from sales of investments	6	6
Net cash used in investing activities	(119)	(193)
Cash flows from financing activities:
Fiduciary receivables and liabilities, net	83	117
Payments on acquisition earn-outs	(100)	(57)
Proceeds from long-term debt	599
Payments on long-term debt	(700)	(238)
Deferred debt issuance costs	(5)
Borrowings on revolving credit facility	150	170
Payments on revolving credit facility	(250)	(170)
Issuances of common stock for employee stock benefit plans	44	41
Repurchase shares to fund tax withholdings for non-cash stock-based compensation	(54)	(40)
Cash dividends paid	(111)	(98)
Other financing activities	3
Net cash used in financing activities	(341)	(275)
Effect of foreign exchange rate changes on cash and cash equivalents inclusive of fiduciary cash	45	2
Net increase in cash and cash equivalents inclusive of fiduciary cash	398	238
Cash and cash equivalents inclusive of fiduciary cash at beginning of period	2,303	2,033
Cash and cash equivalents inclusive of fiduciary cash at end of period	$ 2,701	$ 2,271