| 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 | 54 | 62 | 70 | 84 | 99 | 73 | 240 | 261 | 327 | 482 | 419 | 417 | 455 |
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| Other Depreciation and Amortization | - | - | - | - | - | - | - | - | 63 | 83 | 92 | 92 | 90 |
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| Operating Lease, Right-of-Use Asset, Periodic Reduction | - | - | - | - | - | - | - | - | 66 | 62 | 48 | 41 | 38 |
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| Bad debt (recovery)/expense | 1 | 0 | - | - | 2 | 0 | 1 | 2 | 2 | 2 | 12 | 4 | -4 |
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| Deferred taxes | -4 | 0 | -3 | -15 | -3 | 13 | -48 | -8 | -20 | -47 | -42 | -37 | -64 |
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| Stock-based compensation expense | 7 | 13 | 25 | 46 | 49 | 52 | 59 | 72 | 75 | 112 | 100 | 148 | 167 |
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| Unrealized (gain)/loss on derivative instruments | - | - | - | - | - | - | - | - | - | - | -8 | 8 | - |
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| Impairment charges | - | - | - | - | - | - | - | - | - | - | 24 | 6 | 0 |
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| Loss on sale of business | - | - | - | - | - | - | - | - | - | - | - | -26 | - |
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| Other | 0 | -1 | -1 | -4 | -6 | 4 | 2 | -5 | -7 | -13 | -33 | 1 | -6 |
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| Trade receivables and contract assets | - | - | - | - | - | - | - | - | - | 212 | 193 | -32 | -16 |
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| Prepaid and other assets | 1 | -1 | -1 | 1 | 5 | -4 | 8 | 7 | -7 | 16 | 12 | -8 | 77 |
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| Accounts payable | 1 | -3 | -3 | -3 | 1 | 1 | -1 | -2 | 2 | -2 | -3 | 0 | -29 |
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| Accrued expenses and other liabilities | -6 | 1 | 11 | 27 | -14 | 37 | 42 | 27 | 60 | 156 | 26 | -85 | 11 |
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| Operating lease liabilities | - | - | - | - | - | - | - | -53 | -64 | -64 | -52 | -48 | -39 |
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| Income taxes payable | 5 | 3 | 17 | 9 | 2 | 70 | 18 | - | - | 4 | 4 | -33 | -8 |
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| Net cash provided by operating activities | 48 | 58 | 105 | 76 | 165 | 195 | 292 | 287 | 544 | 572 | 464 | 563 | 559 |
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| Purchases of property and equipment | 13 | 13 | 12 | 13 | 29 | 30 | 38 | 99 | 69 | 112 | 82 | 28 | 32 |
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| Purchases of short-term investments | - | - | - | - | - | - | - | - | - | - | 60 | 11 | 1 |
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| Proceeds from short-term investments | - | - | - | - | - | - | - | - | - | - | - | 11 | 62 |
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| Acquisition of businesses, net of cash acquired (Note 3) | 33 | 0 | 37 | 77 | 6 | 7 | 74 | 39 | 19 | 315 | 11 | 25 | 912 |
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| Purchases of non-marketable securities | - | - | - | - | - | - | - | - | 21 | 3 | 2 | 3 | 8 |
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| Proceeds from sale of non-marketable securities | - | - | - | - | - | - | - | - | - | - | - | - | 4 |
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| Other investing activities, net | - | 8 | 2 | 2 | -0 | 1 | 1 | 7 | -1 | -0 | 29 | 8 | -2 |
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| Net cash used in investing activities | -60 | -22 | -53 | -125 | -9 | -36 | -112 | -145 | -167 | -369 | -183 | -67 | -885 |
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| Proceeds from Stock Options Exercised | 5 | 9 | 11 | 21 | 18 | 54 | 35 | 37 | 26 | 26 | 51 | 52 | 54 |
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| Payments of withholding taxes related to net share settlements of restricted stock units | - | - | - | - | 1 | 3 | 8 | 16 | 20 | 42 | 27 | 29 | 35 |
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| Proceeds from debt | - | - | - | - | - | - | - | - | - | 31 | 2 | 1 | 0 |
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| Repayment of debt | - | - | - | - | 30 | 25 | 3 | 0 | 0 | 31 | 16 | 3 | 2 |
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| Repurchase of common stock | - | - | - | - | - | - | - | - | - | - | - | 165 | 398 |
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| Payment of contingent consideration for previously acquired businesses | - | - | - | - | - | - | - | 1 | 7 | 40 | 7 | 10 | 6 |
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| Other financing activities, net | - | - | - | - | 0 | -1 | -1 | -0 | -0 | -2 | -3 | -4 | -3 |
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| Net cash used in financing activities | 39 | 16 | 10 | 34 | 10 | 50 | 23 | 20 | -1 | -60 | -2 | -166 | -390 |
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| Effect of exchange rate changes on cash, cash equivalents and restricted cash | - | - | - | - | - | - | -14 | 4 | 9 | -18 | -45 | 29 | -36 |
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| Net (decrease)/increase in cash, cash equivalents and restricted cash | - | - | - | - | - | - | 189 | 166 | 386 | 126 | 234 | 359 | -753 |
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| Income Taxes Paid, Net | - | - | - | - | - | - | - | 65 | 55 | 87 | 113 | 177 | 196 |
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| Interest | - | - | - | - | - | - | - | 1 | 0 | 0 | 2 | 5 | 4 |
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| Capital expenditures incurred but not yet paid | - | - | - | - | - | - | - | 17 | 2 | 8 | 57 | 24 | 4 |
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