| 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 | - | - | - | - | - | - | - | 556 | 614 | 623 |
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| Depreciation and amortization | 12 | 12 | 16 | 39 | 53 | 62 | 79 | 123 | 133 | 140 |
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| Share-based compensation | 5 | 8 | 10 | 11 | 14 | 15 | 11 | 12 | 16 | 17 |
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| Loss on sale of assets | - | - | - | - | - | - | - | - | -2 | -1 |
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| Amortization of Financing Costs | - | 0 | 0 | 1 | 2 | 1 | 2 | 3 | 3 | 3 |
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| Provision for bad debt expense | 4 | 3 | 3 | 3 | 7 | 6 | 7 | 6 | 6 | 16 |
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| Inventory Write-down | 2 | 1 | 2 | 2 | 3 | 3 | 3 | 7 | 5 | 8 |
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| Deferred income taxes, net | 17 | -14 | 60 | -13 | -9 | 4 | 3 | -6 | 7 | 3 |
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| Receivables, net | 20 | 20 | 38 | 36 | 27 | -3 | 69 | 169 | -21 | -56 |
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| Inventories | 14 | -1 | 15 | 23 | -17 | 12 | 47 | 94 | -75 | 42 |
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| Prepaid expenses and other current assets | 9 | 10 | -8 | 8 | -9 | 0 | -1 | 9 | 3 | 3 |
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| Accounts payable | 24 | -12 | 18 | 30 | -5 | 17 | 55 | 27 | -9 | -30 |
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| Accrued liabilities | 4 | -4 | 7 | -1 | -3 | 21 | 25 | 21 | -4 | -6 |
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| Other, net | - | -0 | -0 | -1 | 1 | 0 | -1 | 6 | -2 | -2 |
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| Net cash provided by operating activities | - | - | 113 | 167 | 272 | 358 | 403 | 496 | 849 | 776 |
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| Purchases of property and equipment | 14 | 14 | 25 | 53 | 46 | 41 | 56 | 76 | 64 | 69 |
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| Acquisition of businesses, net of cash acquired | - | - | - | 500 | 7 | 83 | 1,267 | 21 | 149 | 137 |
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| Proceeds from sale of assets | - | - | - | - | - | - | - | - | 15 | 3 |
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| Net cash used in investing activities | - | - | -109 | -552 | -50 | -122 | -1,322 | -94 | -198 | -204 |
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| Repayment of long-term debt | 5 | 15 | 186 | 18 | 28 | 325 | 433 | 39 | 40 | 47 |
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| Proceeds from Lines of Credit | - | - | 225 | 90 | - | - | - | 70 | - | - |
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| Repayment of revolving credit facility | - | - | 225 | 90 | - | - | - | 70 | - | - |
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| Taxes withheld and paid on employees' equity awards | - | 2 | 5 | 5 | 13 | 15 | 9 | 12 | 7 | 6 |
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| Exercise of stock options | - | - | - | - | - | 1 | 3 | 2 | 3 | 3 |
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| Repurchase of shares of common stock | - | 22 | 139 | 65 | 111 | 49 | 36 | 250 | - | 966 |
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| Payment of contingent consideration | - | - | - | 1 | 1 | 1 | 1 | 2 | 0 | - |
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| Net cash used in financing activities | - | - | -82 | 429 | -138 | -91 | 729 | -300 | -44 | -1,016 |
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| Impact of exchange rate changes on cash | - | - | - | - | - | - | - | -2 | 1 | -4 |
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| Net (decrease) increase in cash and cash equivalents | - | - | - | - | 84 | 145 | -190 | 100 | 608 | -448 |
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| Interest | - | - | 6 | 24 | 36 | 31 | 22 | 50 | 71 | 70 |
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| Income taxes | 21 | 40 | 23 | 39 | 43 | 78 | 109 | 187 | 221 | 219 |
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| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | - | - | - | - | 129 | 39 | 132 | 104 | 56 | 51 |
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| Accruals for property and equipment | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
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| Share Repurchase Program, Excise Tax | - | - | - | - | - | - | - | - | - | 9 |
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