| 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 | 233 | 207 | 208 | 288 | 319 | 332 | 334 | 404 | 506 | 501 | 447 | 547 | 475 | 462 | 581 |
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| Depreciation | - | - | - | 22 | 22 | 24 | 26 | 27 | 29 | 29 | 31 | 33 | 34 | 35 | 33 |
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| Amortization | 24 | 27 | 33 | - | - | - | - | - | - | 51 | 53 | 59 | 54 | 39 | 42 |
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| Equity in earnings of unconsolidated affiliates | 99 | 106 | 99 | 118 | 128 | 137 | 126 | 153 | 160 | 152 | 117 | 138 | 121 | 127 | 136 |
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| Proceeds from Equity Method Investment, Distribution | 72 | 109 | 92 | 137 | 138 | 142 | 125 | 144 | 167 | 137 | 126 | 131 | 121 | 122 | 139 |
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| Stock-based compensation | 27 | 14 | 16 | 38 | 13 | 17 | 16 | 36 | 24 | 25 | 27 | 41 | 39 | 31 | 59 |
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| Provision for losses on receivables | -1 | -0 | -0 | -0 | 0 | -0 | -0 | 0 | 0 | 0 | -0 | 1 | -1 | -0 | 1 |
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| Deferred income tax benefit | - | -1 | -1 | 23 | 3 | 1 | -5 | 21 | -6 | 3 | 1 | 8 | 46 | 33 | 14 |
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| Net (gain) loss from investments | 49 | 3 | 14 | 1 | 1 | -0 | 0 | 1 | -0 | 3 | -0 | -0 | -3 | 3 | 3 |
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| Net gain from sale of property | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 8 |
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| Change in other long-term liabilities | - | - | -1 | 2 | 2 | 1 | 3 | -2 | 0 | -0 | -0 | 1 | 0 | 1 | -0 |
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| Change in other assets | - | - | - | - | - | - | - | - | - | 2 | -1 | 0 | -6 | 1 | -3 |
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| Contract costs capitalized, net of amortization | - | - | - | - | - | - | - | - | 5 | 7 | 3 | 2 | 2 | 2 | 6 |
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| Contingent consideration fair value adjustment | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -2 |
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| Asset Impairment Charges | - | - | - | - | - | - | - | - | - | - | - | - | - | 6 | 0 |
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| Other | - | 3 | 7 | 4 | 2 | 2 | -0 | 2 | 0 | -1 | -1 | -2 | 5 | 1 | 3 |
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| Receivables from investment products | 11 | 11 | 5 | 8 | 9 | -0 | 14 | -5 | -7 | - | 1 | 4 | 3 | -6 | -2 |
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| Receivables | - | - | - | - | - | - | - | - | - | - | 45 | 54 | 16 | 44 | 66 |
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| Other current assets | - | - | 0 | -2 | 2 | 8 | 1 | 4 | 6 | -3 | 6 | 4 | 5 | 6 | -2 |
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| Advances due from unconsolidated affiliate | - | - | - | - | - | - | - | - | - | - | 39 | 3 | -3 | 1 | 7 |
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| Accounts payable | 2 | -3 | 9 | 5 | -6 | -5 | 1 | -1 | 6 | -6 | 3 | 0 | 3 | -3 | 2 |
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| Accrued liabilities | -14 | -1 | 22 | 15 | 13 | 10 | 19 | 21 | 13 | -5 | 21 | 27 | 32 | -37 | 14 |
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| Deferred revenue | - | - | - | - | - | - | - | - | 0 | 2 | -6 | 4 | 5 | 0 | -5 |
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| Total adjustments | -4 | 50 | 49 | 63 | 56 | 60 | 91 | 56 | 83 | 44 | 41 | 87 | 91 | -15 | 41 |
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| Net cash provided by operating activities | 229 | 257 | 257 | 351 | 375 | 391 | 425 | 460 | 588 | 545 | 489 | 633 | 566 | 447 | 622 |
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| Additions to property and equipment | 14 | 12 | 23 | 16 | 28 | 44 | 31 | 26 | 29 | 43 | 54 | 26 | 39 | 25 | 32 |
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| Additions to capitalized software | - | - | - | - | 35 | 29 | 50 | 61 | 44 | 34 | 24 | 26 | 35 | 34 | 24 |
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| Purchases of marketable securities | 39 | 74 | 34 | 58 | 57 | 53 | 73 | 70 | 203 | 175 | 143 | 216 | 178 | 143 | 177 |
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| Purchases of interest in limited partnerships | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 9 |
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| Prepayments and maturities of marketable securities | - | - | 53 | 40 | 39 | 39 | 54 | 66 | 168 | 171 | 155 | 195 | 161 | 121 | 145 |
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| Sales of marketable securities | - | - | - | - | - | - | - | - | - | 0 | 1 | 0 | 0 | 1 | 8 |
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| Proceeds from fixed asset dispositions | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 10 |
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| Cash paid for acquisitions, net of cash acquired | - | - | - | - | - | - | - | 80 | 6 | - | - | 80 | - | 56 | 29 |
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| Proceeds from insurance settlements | - | - | - | - | - | - | - | - | - | - | - | - | 4 | - | - |
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| Other investing activities | - | - | - | - | 2 | 1 | -1 | 2 | 9 | -3 | 1 | 11 | 3 | 5 | 8 |
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| Net cash used in investing activities | -41 | -32 | 17 | -62 | -53 | -78 | -80 | -172 | -123 | -78 | -67 | -165 | -90 | -142 | -117 |
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| Payments under revolving credit facility | - | - | - | - | - | - | - | 10 | 30 | - | - | - | 40 | - | - |
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| Payment of contingent consideration | - | - | - | - | - | - | - | - | - | 0 | 1 | 4 | 1 | 9 | - |
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| Purchase and retirement of common stock | 120 | 209 | 158 | 207 | 276 | 291 | 292 | 248 | 407 | 346 | 427 | 408 | 345 | 309 | 500 |
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| Proceeds from issuance of common stock | 28 | 24 | 49 | 66 | 105 | 66 | 48 | 54 | 88 | 61 | 49 | 55 | 58 | 101 | 126 |
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| Payment of dividends | 55 | 22 | 135 | 34 | 74 | 80 | 85 | 89 | 94 | 101 | 104 | 106 | 110 | 115 | 120 |
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| Net cash used in financing activities | -282 | -300 | -243 | -163 | -225 | -290 | -320 | -254 | -444 | -387 | -482 | -422 | -437 | -331 | -494 |
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| Effect of exchange rate changes on cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | - | -11 | 6 | 4 | -2 | -17 | 7 | -5 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | - | 10 | 87 | -57 | 44 | 22 | -18 | 5 |
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| Interest paid | - | - | - | - | - | - | - | - | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
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| Income taxes paid | - | - | - | - | - | - | - | - | - | - | - | - | - | 146 | 185 |
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