| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|---|
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
|---|
| Customer Services | 3,761.05 | 3,388.71 | 3,073.28 | 2,695.82 | 2,424.30 | 2,161.22 | 2,015.48 | 1,821.57 | 1,673.96 | 1,573.48 |
| Total Revenues | 3,761.05 | 3,388.71 | 3,073.28 | 2,695.82 | 2,424.30 | 2,161.22 | 2,015.48 | 1,821.57 | 1,673.96 | 1,573.48 |
| Cost of Services Provided | 1,777.01 | 1,603.20 | 1,469.87 | 1,308.40 | 1,162.62 | 1,048.59 | 993.59 | 894.44 | 819.94 | 772.35 |
| Depreciation and amortization | 124.74 | 113.22 | 99.75 | 91.33 | 94.21 | 88.33 | 81.11 | 66.79 | 56.58 | 50.90 |
| Sales, general and administrative | 1,133.23 | 1,015.07 | 915.23 | 802.71 | 727.49 | 656.21 | 623.38 | 550.70 | 503.43 | 490.53 |
| Pension curtailment | -- | -- | -- | -- | -- | -- | 49.90 | -- | -- | -- |
| Restructuring Costs | 0.00 | 0.00 | 5.20 | -- | -- | -- | -- | -- | -- | -- |
| Accelerated stock vesting expense | -- | -- | -- | -- | -- | (6.69) | -- | -- | -- | -- |
| Total Operating Expenses | 3,034.98 | 2,731.48 | 2,490.05 | 2,202.44 | 1,984.31 | -- | -- | -- | -- | -- |
| Operating income | 726.07 | 657.22 | 583.23 | 493.39 | 439.99 | -- | -- | -- | -- | -- |
| Interest expense | 28.56 | 27.68 | 19.06 | 2.64 | 0.83 | -- | -- | -- | -- | -- |
| Gain on sales of assets | -- | -- | -- | -- | -- | (1.60) | 0.58 | 0.88 | 0.24 | 0.78 |
| Interest income | -- | -- | -- | -- | -- | (5.08) | (6.92) | 0.22 | 0.26 | 0.16 |
| Other (income) expense, net | 3.42 | 0.68 | 22.09 | 8.17 | 35.68 | -- | -- | -- | -- | -- |
| Income (loss) before income taxes | 700.93 | 630.23 | 586.26 | 498.92 | 474.84 | 354.72 | 261.16 | 310.73 | 294.50 | 260.64 |
| Provision for Income Taxes | 174.22 | 163.85 | 151.30 | 130.32 | 124.15 | 93.90 | 57.81 | 79.07 | 115.38 | 93.27 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative Effect of Change In Accounting Principle, Net of Taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (Loss) Available to Common Shareholders | 526.71 | 466.38 | 434.96 | 368.60 | 350.69 | 260.82 | 203.35 | 231.66 | 179.12 | 167.37 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle- Basic | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income per share- Basic | 1.09 | 0.96 | 0.89 | 0.75 | 0.71 | 0.53 | 0.41 | 0.47 | 0.36 | 0.34 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle- Diluted | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income per share- Diluted | 1.09 | 0.96 | 0.89 | 0.75 | 0.71 | 0.53 | 0.41 | 0.47 | 0.36 | 0.34 |
| Weighted average shares outstanding - Basic | 484.11 | 484.25 | 489.95 | 492.30 | 492.05 | 491.60 | 491.22 | 490.94 | 490.47 | 491.05 |
| Weighted Average Shares Outstanding (Diluted) | 484.15 | 484.30 | 490.13 | 492.41 | 492.05 | 491.60 | 491.22 | 490.94 | 490.47 | 491.05 |