| 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 | 83 | 115 | 122 | 108 | 125 | 134 | 152 | 139 | 129 | 219 | 151 | 497 | 64 | 42 | 63 |
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| Depreciation and amortization | 15 | 20 | 22 | 40 | 63 | 93 | 122 | 162 | 187 | 232 | 229 | 258 | 233 | 237 | 212 |
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| Non-cash operating lease costs | - | - | - | - | - | - | - | - | - | - | - | - | 13 | 11 | 11 |
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| Share-based compensation | 11 | 9 | 9 | 10 | 9 | 12 | 14 | 23 | 28 | 24 | 24 | 25 | 27 | 32 | 41 |
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| Accounts Receivable, Credit Loss Expense (Reversal) | 2 | 7 | 4 | 3 | 5 | 7 | 13 | 13 | 17 | 13 | 13 | 9 | -0 | 3 | 3 |
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| Deferred income taxes, net | -1 | 7 | 1 | 0 | -10 | -17 | -14 | -21 | 25 | -63 | 6 | -21 | -13 | -30 | -19 |
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| Gain on extinguishment of debt, net | - | - | - | - | - | - | - | - | - | - | - | -14 | 12 | - | - |
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| Loss on sale of businesses | - | - | - | - | - | - | - | 28 | - | - | 17 | -22 | - | - | -4 |
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| Goodwill impairment | - | - | - | - | - | - | - | - | - | - | - | 33 | 27 | 57 | 85 |
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| Changes in fair value of contingent consideration | - | - | - | - | - | - | - | 2 | 19 | 6 | -0 | -1 | -3 | -0 | - |
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| (Income) Loss on Investments, Noncash | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -11 |
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| Loss on investments, net | - | - | - | - | - | - | - | - | - | - | -21 | - | -47 | 0 | -8 |
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| Other | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 5 | 4 |
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| Accounts receivable | 0 | 10 | -5 | -10 | -11 | -19 | 31 | 38 | -4 | 31 | 32 | 18 | -15 | 35 | 153 |
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| Prepaid expenses and other current assets | 2 | -4 | -2 | 0 | -3 | 1 | 1 | -4 | -2 | 9 | -3 | 16 | -10 | 9 | 17 |
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| Other assets | 0 | -0 | -0 | 0 | -0 | -1 | -1 | 3 | -2 | 4 | 0 | 4 | 20 | 6 | -11 |
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| Accounts payable | 1 | 1 | 5 | 9 | -5 | 9 | 6 | -34 | -35 | -1 | 2 | 22 | -38 | 9 | 171 |
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| Deferred revenue | -2 | 9 | 2 | 12 | -1 | -3 | -4 | 1 | 12 | 7 | 5 | 14 | -21 | -7 | 5 |
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| Accrued liabilities and other current liabilities | - | - | - | - | - | - | - | - | - | - | -16 | -15 | -27 | -27 | -27 |
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| Net cash provided by operating activities | 96 | 151 | 170 | 193 | 177 | 229 | 282 | 264 | 401 | 413 | 480 | 517 | 336 | 320 | 390 |
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| Purchases of property and equipment | 2 | 7 | 5 | 19 | 12 | 17 | 25 | 40 | 56 | 71 | 93 | 114 | 106 | 109 | 107 |
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| Acquisition of businesses, net of cash received | 249 | 4 | 198 | 126 | 245 | 303 | 581 | 175 | 312 | 415 | 482 | 141 | 104 | 9 | 218 |
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| Purchases of equity method investment | - | - | - | - | - | - | - | - | 37 | 30 | 32 | 23 | - | - | - |
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| Proceeds from Sale of Other Investments | - | - | - | - | - | - | - | - | - | - | - | 14 | 5 | 3 | 19 |
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| Investment in available-for-sale securities | - | - | - | - | - | - | - | - | - | - | - | - | 15 | - | - |
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| Proceeds from sale of businesses, net of cash divested | - | - | - | - | - | - | - | - | - | - | - | 49 | - | - | 8 |
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| Other | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Net cash used in investing activities | -231 | -76 | -249 | -167 | -275 | -336 | -449 | -158 | -407 | -505 | -586 | 59 | -221 | -127 | -297 |
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| Payment of debt | - | - | - | - | - | - | - | 255 | 2 | 5 | 650 | 512 | 167 | - | 135 |
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| Proceeds from term loan | - | - | - | - | - | - | 179 | 45 | - | 185 | - | - | 112 | - | - |
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| Debt extinguishment costs | - | - | - | - | - | - | - | - | - | - | 29 | 1 | 1 | - | 0 |
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| Repurchase of common stock | 4 | 1 | 60 | 5 | 6 | 4 | 56 | 10 | 47 | 21 | 276 | 78 | 78 | 109 | 185 |
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| Proceeds from Stock Plans | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 5 | 7 | 9 | 9 | 9 | 8 |
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| Proceeds from Stock Options Exercised | 7 | 7 | 6 | 14 | 7 | 5 | 4 | 1 | 2 | 5 | 2 | 3 | 0 | - | - |
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| Deferred payments for acquisitions | - | - | - | - | - | - | - | - | - | 19 | 29 | 14 | 16 | 15 | 8 |
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| Other | - | - | - | -2 | -1 | -0 | -0 | -0 | -0 | -2 | -2 | -4 | -1 | 0 | -1 |
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| Net cash used in financing activities | 3 | 0 | 158 | -36 | 328 | -67 | 41 | 112 | -131 | 457 | -235 | -113 | -141 | -115 | -321 |
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| Effect of exchange rate changes on cash and cash equivalents | - | - | - | - | - | - | - | - | - | - | - | - | -17 | 7 | -4 |
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| Net change in cash and cash equivalents | - | - | - | - | - | - | - | - | - | - | -333 | 452 | -42 | 85 | -232 |
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