| 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 | 22 | 30 | 40 | 32 | 28 | 39 | 66 | 84 | 135 | 151 | 138 | 124 | 179 | 171 | 91 |
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| Depreciation and amortization | 15 | 15 | 18 | 21 | 21 | 19 | 17 | 18 | 23 | 29 | 31 | 39 | 41 | 43 | 44 |
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| Stock-based compensation | 8 | 9 | 10 | 11 | 11 | 13 | 17 | 24 | 20 | 24 | 60 | 41 | 50 | 53 | 61 |
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| Deferred income taxes | 1 | -0 | -6 | -2 | -2 | -15 | 3 | 10 | -5 | 5 | -6 | 5 | -11 | -5 | -14 |
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| Accounts receivable | 19 | 29 | 19 | 20 | -35 | 26 | 70 | 64 | 67 | 65 | -73 | 121 | 109 | 71 | 135 |
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| Prepaid insurance and related assets | 10 | -4 | -6 | -5 | 11 | -14 | 8 | -4 | -2 | 2 | -0 | 1 | 0 | -5 | 18 |
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| Other current assets | - | 3 | -2 | 2 | 6 | -1 | 2 | 7 | 1 | 16 | -4 | 14 | 5 | 14 | 8 |
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| Other assets and ROU assets | - | - | - | - | - | - | - | - | - | - | -16 | -4 | -2 | -24 | -25 |
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| Accounts payable | 1 | 2 | -1 | -1 | 2 | 1 | -1 | 2 | 4 | -6 | 2 | 0 | 1 | 3 | -1 |
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| Payroll taxes and other payroll deductions payable | 17 | 24 | 10 | -13 | 11 | 29 | 42 | 55 | -42 | 16 | 101 | 90 | 88 | 10 | 335 |
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| Accrued worksite employee payroll costs | - | - | - | - | - | - | - | - | - | 72 | -67 | 75 | 104 | 46 | 171 |
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| Accrued health insurance costs | 9 | -6 | 5 | -9 | 13 | -5 | 13 | -0 | 9 | -14 | 12 | 17 | 3 | -7 | -27 |
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| Accrued workers’ compensation costs | 9 | 9 | 7 | 8 | 16 | 26 | 22 | 24 | 24 | 13 | -3 | -0 | -10 | -10 | -17 |
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| Increase (Decrease) in Accrued Salaries | 17 | 21 | 20 | 24 | 19 | -30 | 53 | 52 | 63 | 6 | -21 | 15 | -5 | -45 | -2 |
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| Income taxes payable/receivable | - | -2 | 6 | -5 | 4 | -1 | -8 | -5 | 11 | -5 | 6 | -14 | 19 | -4 | 15 |
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| Total adjustments | 56 | 43 | 50 | 3 | 114 | 26 | 67 | 120 | 49 | 54 | 208 | 136 | 168 | 27 | 429 |
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| Net cash provided by operating activities | 79 | 74 | 91 | 35 | 142 | 65 | 133 | 204 | 184 | 205 | 346 | 260 | 348 | 198 | 520 |
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| Purchases | 60 | 51 | 31 | 55 | 70 | 11 | 1 | 2 | 88 | 110 | 51 | 58 | 47 | 48 | 23 |
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| Proceeds from maturities | - | - | - | - | - | - | - | - | - | - | - | - | - | 39 | 23 |
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| Proceeds from dispositions | - | - | - | - | - | - | - | - | - | - | - | - | - | 28 | - |
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| Property and equipment purchases | 7 | 31 | 18 | 12 | 19 | 18 | 34 | 33 | 35 | 56 | 98 | 33 | 30 | 40 | 38 |
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| Net cash used in investing activities | -59 | -62 | 18 | -43 | -3 | 12 | -26 | -33 | -94 | -30 | -99 | -31 | -32 | -22 | -38 |
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| Purchase of treasury stock | 8 | 25 | 3 | - | - | - | 144 | - | - | - | - | - | - | 132 | 63 |
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| Dividends paid | 14 | 16 | 43 | 17 | 69 | 21 | 21 | 66 | 33 | 49 | 62 | 144 | 77 | 84 | 89 |
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| Client funds liability and other | 1 | -1 | -0 | 1 | 1 | 1 | 1 | 2 | 2 | 8 | 8 | 6 | 9 | 61 | -21 |
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| Net cash used in financing activities | -13 | -36 | -55 | -30 | -88 | -84 | -90 | -103 | -104 | -118 | -54 | -208 | -141 | -155 | -173 |
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| Net increase in cash, cash equivalents, restricted cash, funds held for clients, and deposits – workers’ compensation | - | - | - | - | - | - | - | - | -14 | 57 | 194 | 21 | 174 | 22 | 309 |
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| ROU assets obtained in exchange for lease obligations | - | - | - | - | - | - | - | - | - | 24 | 23 | 20 | 10 | 22 | 29 |
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| Excisetaxliabilityaccruedforcommonstockrepurchases | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - |
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| Interest Paid, Excluding Capitalized Interest, Operating Activities | - | - | - | - | - | - | - | - | - | 7 | 9 | 7 | 13 | 22 | 32 |
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| Income Taxes Paid, Net | - | - | - | - | - | - | - | - | - | 38 | 51 | 54 | 57 | 63 | 33 |
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