| 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 | 149 | 191 | 185 | 235 | 192 | 240 | 268 | 261 | 281 | 305 | 308 | 369 | 353 | 631 | 514 |
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| Depreciation | 58 | 58 | 56 | 53 | 51 | 54 | 55 | 59 | 65 | 96 | 116 | 109 | 87 | 73 | 70 |
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| Amortization Of Financing Costs Including Loss On Extinguishment Of Debt | - | - | - | - | - | - | - | 2 | 4 | 2 | 2 | 3 | 2 | 2 | 2 |
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| Amortization of Intangible Assets | 16 | 20 | 23 | 24 | 29 | 29 | 27 | 36 | 39 | 33 | 43 | 58 | 43 | 31 | 26 |
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| Asset Impairment Charges, Held For Use | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - |
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| Impairment of Long-Lived Assets to be Disposed of | - | - | - | - | - | - | - | - | - | - | - | - | 33 | - | - |
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| Loss on sale of business classified as held for sale (refer to Note 8) | - | - | - | - | - | - | - | - | - | - | - | - | - | -1 | - |
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| Allowance for credit losses | -1 | 6 | -4 | 11 | 3 | 2 | 7 | 10 | 2 | 7 | 6 | 1 | 2 | 4 | 14 |
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| Unrealized Gain (Loss), Foreign Currency Transaction, before Tax | 0 | 18 | 14 | 6 | -9 | 5 | -2 | 12 | -3 | 5 | -10 | 8 | -1 | 1 | 11 |
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| Stock-based compensation expense | 18 | 28 | 32 | 31 | 28 | 25 | 25 | 36 | 49 | 84 | 74 | 82 | 77 | 89 | 66 |
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| Deferred tax expense (benefit) | -5 | -8 | -10 | -1 | -12 | -19 | 30 | -10 | 6 | -16 | -23 | -9 | -29 | -158 | 37 |
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| Write-down of operating right-of-use assets and other assets | - | - | - | - | - | - | - | - | - | - | - | - | 20 | - | - |
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| Others, net | - | 5 | -6 | -6 | -1 | 0 | 0 | 5 | -1 | 2 | 1 | -1 | -1 | -1 | 2 |
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| (Increase) in accounts receivable | 50 | 46 | 36 | 61 | 24 | 79 | 49 | 57 | 77 | 122 | -43 | 12 | 112 | 131 | 97 |
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| (Increase) decrease in prepaid expenses, other current assets, contract cost assets, operating lease right-of-use assets and other assets | - | - | - | - | - | - | - | - | - | 70 | 100 | -83 | -4 | 39 | 74 |
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| Increase (decrease) in accounts payable | -3 | 7 | -4 | 2 | -7 | -4 | -0 | -2 | 26 | -21 | -12 | 12 | 14 | -8 | 9 |
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| Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities | - | - | - | - | - | 70 | 28 | 47 | 6 | 158 | 87 | -2 | -54 | 2 | 63 |
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| Increase (decrease) in income taxes payable | 6 | 10 | 2 | -7 | -2 | 19 | 1 | 5 | 6 | 8 | -1 | 6 | 2 | -6 | -2 |
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| Net cash provided by operating activities | 163 | 267 | 311 | 312 | 272 | - | - | - | 340 | 428 | 584 | 694 | 444 | 491 | 615 |
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| Purchase of property, plant and equipment | 55 | 36 | 83 | 49 | 63 | 62 | 89 | 57 | 85 | 75 | 70 | 53 | 51 | 55 | 83 |
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| Payment for internally generated intangible assets (including intangibles under development) | - | - | - | - | - | - | - | 16 | 75 | 34 | 10 | 4 | 4 | 3 | 2 |
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| Purchase of short term investments | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 23 |
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| Proceeds from sale of property, plant and equipment | 1 | 1 | 1 | 3 | 1 | 1 | 1 | 2 | 1 | 2 | 1 | 6 | 0 | 0 | 3 |
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| Payment for business acquisitions, net of cash acquired | 43 | 577 | 56 | 49 | 131 | 21 | 45 | 285 | 112 | 252 | 187 | 72 | 0 | 1 | - |
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| Proceeds from/(payment) for divestiture of business | - | - | - | 2 | - | - | 17 | -5 | - | - | - | 0 | 18 | -20 | - |
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| Net cash used for investing activities | -33 | -535 | -158 | -78 | -193 | - | - | - | -276 | -357 | -266 | -123 | -37 | -79 | -106 |
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| Repayment of finance lease obligations | - | - | - | - | - | - | - | - | - | 7 | 11 | 14 | 13 | 12 | 11 |
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| Payment of debt issuance and refinancing costs | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 4 |
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| Proceeds from long-term debt | - | 120 | 675 | 121 | - | 800 | - | 350 | 129 | 400 | - | 350 | 239 | - | 400 |
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| Repayment of long-term debt | 45 | 40 | 107 | 123 | 7 | 685 | 40 | 40 | 166 | 34 | 34 | 34 | 620 | 20 | 433 |
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| Proceeds from Short-Term Debt | - | - | 80 | 275 | 195 | 1,452 | 200 | 295 | 250 | 400 | 610 | - | 261 | 148 | 50 |
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| Repayment of short-term borrowings | - | - | 253 | 355 | 60 | 1,565 | 62 | 285 | 125 | 625 | 430 | 250 | 110 | 289 | 60 |
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| Proceeds from issuance of common shares under stock-based compensation plans | 25 | 13 | 26 | 46 | 30 | 16 | 18 | 16 | 14 | 20 | 25 | 35 | 28 | 39 | 17 |
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| Payment for net settlement of stock-based awards | - | - | 2 | 9 | 26 | 7 | 1 | 10 | 16 | 4 | 34 | 36 | 45 | 22 | 22 |
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| Payment of earn-out consideration | - | - | - | 4 | - | 0 | 1 | 6 | 3 | 13 | 7 | 3 | 2 | 2 | - |
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| Dividend paid | - | - | - | - | - | - | - | - | - | 65 | 74 | 80 | 92 | 100 | 108 |
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| Payment for stock repurchased and retired (including expenses related to stock repurchased) | - | - | - | - | 303 | 227 | 345 | 220 | 154 | 30 | 137 | 298 | 214 | 225 | 253 |
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| Net cash used for financing activities | -32 | 326 | -105 | -65 | -177 | - | - | - | -135 | 40 | -92 | -333 | -571 | -483 | -425 |
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| Effect of exchange rate changes | - | - | - | - | - | - | - | - | - | -12 | -13 | -20 | -88 | 8 | -20 |
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| Net increase (decrease) in cash and cash equivalents | - | - | - | - | - | - | - | - | - | 110 | - | 239 | -164 | -71 | 85 |
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| Interest Paid, Excluding Capitalized Interest, Operating Activities | - | - | - | - | - | - | - | - | 41 | 45 | 49 | 46 | 51 | 48 | 69 |
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| Income Taxes Paid | - | - | - | - | - | - | - | - | 81 | 104 | 194 | 32 | 146 | 157 | 114 |
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| Lease Obligation Incurred | 2 | 2 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 5 | 30 | 0 | 7 | 2 | 11 |
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