| Dec 31, 2010 | Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1,002 |
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| Amortization | - | - | - | - | - | - | - | - | - | 105 | 109 | 120 | 147 | 166 | 178 |
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| Depreciation | 13 | 12 | 15 | 17 | 21 | 21 | 21 | 23 | 23 | 23 | 26 | 33 | 39 | 40 | 44 |
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| Non-cash stock-based compensation | 7 | 11 | 16 | 23 | 19 | 16 | 16 | 31 | 34 | 47 | 60 | 61 | 66 | 89 | 101 |
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| Change in estimated acquisition earn-out payables | - | - | - | - | - | - | - | - | - | -1 | -4 | 40 | -39 | 22 | 2 |
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| Deferred income taxes | 23 | 30 | 33 | 32 | 7 | 23 | 18 | -102 | 15 | 12 | 16 | 34 | 43 | 12 | 13 |
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| Amortization of Debt Discount (Premium) | - | - | - | - | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 3 | 4 | 1 | - |
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| Amortization of discounts and premiums, investment | - | - | - | - | - | - | -0 | -0 | 0 | 0 | -0 | -0 | -0 | -3 | - |
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| Net (gain)/loss on sales/disposals of businesses, investments, fixed assets and customer accounts | - | - | - | - | - | - | - | - | - | - | - | - | - | 140 | - |
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| Net gain on sales/disposals of investments, businesses, fixed assets and customer accounts | 1 | 2 | 4 | 3 | -42 | 0 | -1 | 2 | 2 | 10 | 1 | 7 | 4 | - | 29 |
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| Payments on acquisition earn-outs in excess of original estimated payables | - | 1 | 4 | 3 | 3 | 11 | 4 | 15 | 13 | 0 | 5 | 21 | 30 | 29 | 37 |
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| Effect of changes in foreign exchange rate changes | - | - | - | - | - | - | - | - | - | - | - | 0 | -1 | 0 | - |
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| Other | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 5 |
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| Commissions, fees and other receivables (increase) decrease | -3 | 21 | 11 | 41 | 11 | 7 | 64 | 43 | 94 | 87 | 135 | 73 | 61 | 106 | 94 |
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| Reinsurance recoverable (increase) decrease | - | - | - | - | -12 | 19 | 46 | 400 | -412 | -7 | -15 | 20 | 768 | -706 | 1,402 |
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| Prepaid reinsurance premiums (increase) decrease | - | - | - | - | 32 | -11 | -1 | 12 | 17 | 28 | 12 | 15 | 1 | 68 | 58 |
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| Other assets (increase) decrease | -15 | 7 | -2 | 3 | 13 | 5 | 5 | 10 | 22 | 47 | 43 | 54 | 18 | 118 | 98 |
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| Losses and loss adjustment reserve increase (decrease) | - | - | - | - | - | 19 | 46 | 399 | -412 | -7 | -15 | 20 | 778 | -710 | 1,411 |
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| Unearned premiums increase (decrease) | - | - | - | - | 32 | -11 | -1 | 12 | 17 | 28 | 12 | 15 | 20 | 50 | 115 |
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| Accounts payable increase (decrease) | 28 | -3 | 37 | 5 | 37 | 34 | 30 | 27 | 22 | 18 | 108 | 51 | 124 | 260 | -47 |
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| Accrued expenses and other liabilities increase (decrease) | - | 4 | -43 | 71 | 12 | 8 | 9 | 26 | 23 | 43 | 35 | 67 | 37 | 43 | 35 |
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| Other liabilities increase (decrease) | -5 | -6 | -24 | -13 | -25 | -24 | -26 | -32 | -9 | 16 | -72 | -47 | -128 | -83 | 33 |
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| Net cash provided by operating activities | 296 | 238 | 220 | 389 | - | - | - | - | - | 678 | 722 | 942 | 881 | 1,010 | 1,174 |
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| Additions to fixed assets | 10 | 14 | 24 | 16 | 25 | 18 | 18 | 24 | 42 | 73 | 71 | 45 | 53 | 69 | 82 |
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| Payments for businesses acquired, net of cash acquired | 158 | 166 | 425 | 368 | 696 | 136 | 123 | 41 | 924 | 353 | 695 | 367 | 1,928 | 631 | 890 |
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| Proceeds from sales of businesses, fixed assets and customer accounts | - | - | - | - | - | - | - | - | - | - | - | - | - | 107 | 70 |
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| Proceeds from Sale of Productive Assets | 2 | 4 | 14 | 6 | 14 | 11 | 5 | 4 | 5 | 22 | 10 | 17 | 60 | - | - |
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| Purchases of investments | 9 | 13 | 11 | 18 | 18 | 23 | 26 | 11 | 9 | 18 | 14 | 12 | 0 | 7 | 7 |
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| Proceeds from sales of investments | 9 | 13 | 11 | 16 | 18 | 22 | 19 | 10 | 18 | 8 | 11 | 11 | 7 | 13 | 11 |
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| Net cash used in investing activities | -166 | -176 | -435 | -381 | - | - | - | - | - | -414 | -759 | -397 | -1,913 | -587 | -898 |
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| Fiduciary receivables and liabilities, net | - | - | - | - | - | - | - | - | - | - | - | - | -96 | -188 | -191 |
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| Deferred acquisition purchase payment | - | - | - | - | - | - | - | - | - | - | - | - | 5 | - | - |
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| Payments on acquisition earn-outs | -2 | 9 | 14 | 15 | 10 | 25 | 24 | 29 | 14 | 10 | 25 | 63 | 76 | 90 | 117 |
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| Proceeds from long-term debt | - | 100 | 200 | 30 | 1,048 | - | - | - | 300 | 350 | 700 | - | 2,000 | - | 599 |
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| Payments on long-term debt | 19 | 102 | 1 | 0 | 330 | 46 | 73 | 97 | 120 | 50 | 55 | 73 | 61 | 251 | 719 |
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| Deferred debt issuance costs | - | - | - | - | - | - | - | 3 | 1 | 4 | 7 | 3 | 23 | - | 5 |
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| Proceeds from Lines of Credit | - | - | 100 | 32 | 475 | - | - | - | 600 | 100 | 250 | - | 350 | 420 | 500 |
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| Payments on revolving credit facilities | - | - | 100 | 32 | 475 | - | - | - | 250 | 350 | 350 | - | 350 | 320 | 350 |
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| Proceeds from Stock Options Exercised | 11 | 9 | 13 | 12 | 15 | 16 | 16 | 17 | 19 | 25 | 30 | 34 | 38 | 40 | 44 |
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| Repurchase shares to fund tax withholdings for non-cash stock-based compensation | 10 | 1 | 9 | 1 | 3 | 3 | 8 | 8 | 12 | 11 | 41 | 50 | 49 | 40 | 55 |
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| Purchase of treasury stock | - | - | - | - | 75 | 164 | 19 | 129 | 91 | 59 | 55 | 83 | 74 | 0 | - |
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| Cash dividends paid | 44 | 46 | 50 | 54 | 59 | 64 | 70 | 78 | 85 | 91 | 101 | 107 | 120 | 135 | 154 |
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| Other financing activities | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
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| Net cash (used in) provided by financing activities | -54 | -48 | 149 | -26 | - | - | - | - | - | -79 | 346 | -344 | 1,725 | -187 | -64 |
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| Effect of foreign exchange rate changes on cash and cash equivalents inclusive of fiduciary cash | - | - | - | - | - | - | - | - | - | - | - | - | -131 | 34 | -13 |
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| Net increase in cash and cash equivalents inclusive of fiduciary cash | - | - | - | - | - | - | - | - | - | 185 | 309 | 198 | 563 | 270 | 199 |
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